diff --git a/modules/openapi-generator/src/main/resources/python/model_utils.mustache b/modules/openapi-generator/src/main/resources/python/model_utils.mustache
index 73e6e7d555b0..c7944e4fdcf5 100644
--- a/modules/openapi-generator/src/main/resources/python/model_utils.mustache
+++ b/modules/openapi-generator/src/main/resources/python/model_utils.mustache
@@ -1335,12 +1335,20 @@ def model_to_dict(model_instance, serialize=True):
     model_instances = [model_instance]
     if model_instance._composed_schemas:
         model_instances.extend(model_instance._composed_instances)
+    seen_json_attribute_names = set()
+    used_fallback_python_attribute_names = set()
+    py_to_json_map = {}
     for model_instance in model_instances:
         for attr, value in model_instance._data_store.items():
             if serialize:
                 # we use get here because additional property key names do not
                 # exist in attribute_map
-                attr = model_instance.attribute_map.get(attr, attr)
+                try:
+                    attr = model_instance.attribute_map[attr]
+                    py_to_json_map.update(model_instance.attribute_map)
+                    seen_json_attribute_names.add(attr)
+                except KeyError:
+                    used_fallback_python_attribute_names.add(attr)
             if isinstance(value, list):
                if not value:
                    # empty list or None
@@ -1368,6 +1376,16 @@ def model_to_dict(model_instance, serialize=True):
                 result[attr] = model_to_dict(value, serialize=serialize)
             else:
                 result[attr] = value
+    if serialize:
+        for python_key in used_fallback_python_attribute_names:
+            json_key = py_to_json_map.get(python_key)
+            if json_key is None:
+                continue
+            if python_key == json_key:
+                continue
+            json_key_assigned_no_need_for_python_key = json_key in seen_json_attribute_names
+            if json_key_assigned_no_need_for_python_key:
+                del result[python_key]
 
     return result
 
diff --git a/modules/openapi-generator/src/test/resources/3_0/python/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml b/modules/openapi-generator/src/test/resources/3_0/python/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml
index 683641e5a862..4efbc9cc0283 100644
--- a/modules/openapi-generator/src/test/resources/3_0/python/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/python/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml
@@ -1288,11 +1288,11 @@ paths:
             application/json:
               schema:
                 $ref: '#/components/schemas/HealthCheckResult'
-  /fake/getInlineAdditionalPropertiesRefPayload:
-    get:
+  /fake/postInlineAdditionalPropertiesRefPayload:
+    post:
       tags:
         - fake
-      operationId: getInlineAdditionalPropertiesRefPayload
+      operationId: postInlineAdditionalPropertiesRefPayload
       responses:
         200:
           description: InlineAdditionalPropertiesRefPayload
@@ -1305,11 +1305,11 @@ paths:
           application/json:
             schema:
               $ref: '#/components/schemas/InlineAdditionalPropertiesRefPayload'
-  /fake/getInlineAdditionalPropertiesPayload:
-    get:
+  /fake/postInlineAdditionalPropertiesPayload:
+    post:
       tags:
         - fake
-      operationId: getInlineAdditionalPropertiesPayload
+      operationId: postInlineAdditionalPropertiesPayload
       responses:
         200:
           description: InlineAdditionalPropertiesPayload
diff --git a/samples/client/petstore/python/petstore_api/model_utils.py b/samples/client/petstore/python/petstore_api/model_utils.py
index 3913228d6b89..97f9b2881cc5 100644
--- a/samples/client/petstore/python/petstore_api/model_utils.py
+++ b/samples/client/petstore/python/petstore_api/model_utils.py
@@ -1632,12 +1632,20 @@ def model_to_dict(model_instance, serialize=True):
     model_instances = [model_instance]
     if model_instance._composed_schemas:
         model_instances.extend(model_instance._composed_instances)
+    seen_json_attribute_names = set()
+    used_fallback_python_attribute_names = set()
+    py_to_json_map = {}
     for model_instance in model_instances:
         for attr, value in model_instance._data_store.items():
             if serialize:
                 # we use get here because additional property key names do not
                 # exist in attribute_map
-                attr = model_instance.attribute_map.get(attr, attr)
+                try:
+                    attr = model_instance.attribute_map[attr]
+                    py_to_json_map.update(model_instance.attribute_map)
+                    seen_json_attribute_names.add(attr)
+                except KeyError:
+                    used_fallback_python_attribute_names.add(attr)
             if isinstance(value, list):
                if not value:
                    # empty list or None
@@ -1665,6 +1673,16 @@ def model_to_dict(model_instance, serialize=True):
                 result[attr] = model_to_dict(value, serialize=serialize)
             else:
                 result[attr] = value
+    if serialize:
+        for python_key in used_fallback_python_attribute_names:
+            json_key = py_to_json_map.get(python_key)
+            if json_key is None:
+                continue
+            if python_key == json_key:
+                continue
+            json_key_assigned_no_need_for_python_key = json_key in seen_json_attribute_names
+            if json_key_assigned_no_need_for_python_key:
+                del result[python_key]
 
     return result
 
diff --git a/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/model_utils.py b/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/model_utils.py
index 3913228d6b89..97f9b2881cc5 100644
--- a/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/model_utils.py
+++ b/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/model_utils.py
@@ -1632,12 +1632,20 @@ def model_to_dict(model_instance, serialize=True):
     model_instances = [model_instance]
     if model_instance._composed_schemas:
         model_instances.extend(model_instance._composed_instances)
+    seen_json_attribute_names = set()
+    used_fallback_python_attribute_names = set()
+    py_to_json_map = {}
     for model_instance in model_instances:
         for attr, value in model_instance._data_store.items():
             if serialize:
                 # we use get here because additional property key names do not
                 # exist in attribute_map
-                attr = model_instance.attribute_map.get(attr, attr)
+                try:
+                    attr = model_instance.attribute_map[attr]
+                    py_to_json_map.update(model_instance.attribute_map)
+                    seen_json_attribute_names.add(attr)
+                except KeyError:
+                    used_fallback_python_attribute_names.add(attr)
             if isinstance(value, list):
                if not value:
                    # empty list or None
@@ -1665,6 +1673,16 @@ def model_to_dict(model_instance, serialize=True):
                 result[attr] = model_to_dict(value, serialize=serialize)
             else:
                 result[attr] = value
+    if serialize:
+        for python_key in used_fallback_python_attribute_names:
+            json_key = py_to_json_map.get(python_key)
+            if json_key is None:
+                continue
+            if python_key == json_key:
+                continue
+            json_key_assigned_no_need_for_python_key = json_key in seen_json_attribute_names
+            if json_key_assigned_no_need_for_python_key:
+                del result[python_key]
 
     return result
 
diff --git a/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/model_utils.py b/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/model_utils.py
index 7993d12971b2..bd30ebabb27f 100644
--- a/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/model_utils.py
+++ b/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/model_utils.py
@@ -1632,12 +1632,20 @@ def model_to_dict(model_instance, serialize=True):
     model_instances = [model_instance]
     if model_instance._composed_schemas:
         model_instances.extend(model_instance._composed_instances)
+    seen_json_attribute_names = set()
+    used_fallback_python_attribute_names = set()
+    py_to_json_map = {}
     for model_instance in model_instances:
         for attr, value in model_instance._data_store.items():
             if serialize:
                 # we use get here because additional property key names do not
                 # exist in attribute_map
-                attr = model_instance.attribute_map.get(attr, attr)
+                try:
+                    attr = model_instance.attribute_map[attr]
+                    py_to_json_map.update(model_instance.attribute_map)
+                    seen_json_attribute_names.add(attr)
+                except KeyError:
+                    used_fallback_python_attribute_names.add(attr)
             if isinstance(value, list):
                if not value:
                    # empty list or None
@@ -1665,6 +1673,16 @@ def model_to_dict(model_instance, serialize=True):
                 result[attr] = model_to_dict(value, serialize=serialize)
             else:
                 result[attr] = value
+    if serialize:
+        for python_key in used_fallback_python_attribute_names:
+            json_key = py_to_json_map.get(python_key)
+            if json_key is None:
+                continue
+            if python_key == json_key:
+                continue
+            json_key_assigned_no_need_for_python_key = json_key in seen_json_attribute_names
+            if json_key_assigned_no_need_for_python_key:
+                del result[python_key]
 
     return result
 
diff --git a/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/model_utils.py b/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/model_utils.py
index 2fcf6b2de1e4..c73de2486818 100644
--- a/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/model_utils.py
+++ b/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/model_utils.py
@@ -1632,12 +1632,20 @@ def model_to_dict(model_instance, serialize=True):
     model_instances = [model_instance]
     if model_instance._composed_schemas:
         model_instances.extend(model_instance._composed_instances)
+    seen_json_attribute_names = set()
+    used_fallback_python_attribute_names = set()
+    py_to_json_map = {}
     for model_instance in model_instances:
         for attr, value in model_instance._data_store.items():
             if serialize:
                 # we use get here because additional property key names do not
                 # exist in attribute_map
-                attr = model_instance.attribute_map.get(attr, attr)
+                try:
+                    attr = model_instance.attribute_map[attr]
+                    py_to_json_map.update(model_instance.attribute_map)
+                    seen_json_attribute_names.add(attr)
+                except KeyError:
+                    used_fallback_python_attribute_names.add(attr)
             if isinstance(value, list):
                if not value:
                    # empty list or None
@@ -1665,6 +1673,16 @@ def model_to_dict(model_instance, serialize=True):
                 result[attr] = model_to_dict(value, serialize=serialize)
             else:
                 result[attr] = value
+    if serialize:
+        for python_key in used_fallback_python_attribute_names:
+            json_key = py_to_json_map.get(python_key)
+            if json_key is None:
+                continue
+            if python_key == json_key:
+                continue
+            json_key_assigned_no_need_for_python_key = json_key in seen_json_attribute_names
+            if json_key_assigned_no_need_for_python_key:
+                del result[python_key]
 
     return result
 
diff --git a/samples/openapi3/client/petstore/python/.openapi-generator/FILES b/samples/openapi3/client/petstore/python/.openapi-generator/FILES
index 9e23967bd9af..bf96206001f5 100644
--- a/samples/openapi3/client/petstore/python/.openapi-generator/FILES
+++ b/samples/openapi3/client/petstore/python/.openapi-generator/FILES
@@ -40,7 +40,7 @@ docs/EnumTest.md
 docs/EquilateralTriangle.md
 docs/FakeApi.md
 docs/FakeClassnameTags123Api.md
-docs/FakeGetInlineAdditionalPropertiesPayloadArrayData.md
+docs/FakePostInlineAdditionalPropertiesPayloadArrayData.md
 docs/File.md
 docs/FileSchemaTestClass.md
 docs/Foo.md
@@ -150,7 +150,7 @@ petstore_api/model/enum_arrays.py
 petstore_api/model/enum_class.py
 petstore_api/model/enum_test.py
 petstore_api/model/equilateral_triangle.py
-petstore_api/model/fake_get_inline_additional_properties_payload_array_data.py
+petstore_api/model/fake_post_inline_additional_properties_payload_array_data.py
 petstore_api/model/file.py
 petstore_api/model/file_schema_test_class.py
 petstore_api/model/foo.py
diff --git a/samples/openapi3/client/petstore/python/README.md b/samples/openapi3/client/petstore/python/README.md
index bf7ae031db41..beb64bb7e04e 100644
--- a/samples/openapi3/client/petstore/python/README.md
+++ b/samples/openapi3/client/petstore/python/README.md
@@ -91,11 +91,11 @@ Class | Method | HTTP request | Description
 *FakeApi* | [**download_attachment**](docs/FakeApi.md#download_attachment) | **GET** /{fileName} | downloads a file using Content-Disposition
 *FakeApi* | [**enum_test**](docs/FakeApi.md#enum_test) | **POST** /fake/refs/enum-test | Object contains enum properties and array properties containing enums
 *FakeApi* | [**fake_health_get**](docs/FakeApi.md#fake_health_get) | **GET** /fake/health | Health check endpoint
-*FakeApi* | [**get_inline_additional_properties_payload**](docs/FakeApi.md#get_inline_additional_properties_payload) | **GET** /fake/getInlineAdditionalPropertiesPayload | 
-*FakeApi* | [**get_inline_additional_properties_ref_payload**](docs/FakeApi.md#get_inline_additional_properties_ref_payload) | **GET** /fake/getInlineAdditionalPropertiesRefPayload | 
 *FakeApi* | [**mammal**](docs/FakeApi.md#mammal) | **POST** /fake/refs/mammal | 
 *FakeApi* | [**number_with_validations**](docs/FakeApi.md#number_with_validations) | **POST** /fake/refs/number | 
 *FakeApi* | [**object_model_with_ref_props**](docs/FakeApi.md#object_model_with_ref_props) | **POST** /fake/refs/object_model_with_ref_props | 
+*FakeApi* | [**post_inline_additional_properties_payload**](docs/FakeApi.md#post_inline_additional_properties_payload) | **POST** /fake/postInlineAdditionalPropertiesPayload | 
+*FakeApi* | [**post_inline_additional_properties_ref_payload**](docs/FakeApi.md#post_inline_additional_properties_ref_payload) | **POST** /fake/postInlineAdditionalPropertiesRefPayload | 
 *FakeApi* | [**string**](docs/FakeApi.md#string) | **POST** /fake/refs/string | 
 *FakeApi* | [**string_enum**](docs/FakeApi.md#string_enum) | **POST** /fake/refs/enum | 
 *FakeApi* | [**test_body_with_file_schema**](docs/FakeApi.md#test_body_with_file_schema) | **PUT** /fake/body-with-file-schema | 
@@ -168,7 +168,7 @@ Class | Method | HTTP request | Description
  - [EnumClass](docs/EnumClass.md)
  - [EnumTest](docs/EnumTest.md)
  - [EquilateralTriangle](docs/EquilateralTriangle.md)
- - [FakeGetInlineAdditionalPropertiesPayloadArrayData](docs/FakeGetInlineAdditionalPropertiesPayloadArrayData.md)
+ - [FakePostInlineAdditionalPropertiesPayloadArrayData](docs/FakePostInlineAdditionalPropertiesPayloadArrayData.md)
  - [File](docs/File.md)
  - [FileSchemaTestClass](docs/FileSchemaTestClass.md)
  - [Foo](docs/Foo.md)
diff --git a/samples/openapi3/client/petstore/python/docs/FakeApi.md b/samples/openapi3/client/petstore/python/docs/FakeApi.md
index acc41cb48998..5802b45cb399 100644
--- a/samples/openapi3/client/petstore/python/docs/FakeApi.md
+++ b/samples/openapi3/client/petstore/python/docs/FakeApi.md
@@ -12,11 +12,11 @@ Method | HTTP request | Description
 [**download_attachment**](FakeApi.md#download_attachment) | **GET** /{fileName} | downloads a file using Content-Disposition
 [**enum_test**](FakeApi.md#enum_test) | **POST** /fake/refs/enum-test | Object contains enum properties and array properties containing enums
 [**fake_health_get**](FakeApi.md#fake_health_get) | **GET** /fake/health | Health check endpoint
-[**get_inline_additional_properties_payload**](FakeApi.md#get_inline_additional_properties_payload) | **GET** /fake/getInlineAdditionalPropertiesPayload | 
-[**get_inline_additional_properties_ref_payload**](FakeApi.md#get_inline_additional_properties_ref_payload) | **GET** /fake/getInlineAdditionalPropertiesRefPayload | 
 [**mammal**](FakeApi.md#mammal) | **POST** /fake/refs/mammal | 
 [**number_with_validations**](FakeApi.md#number_with_validations) | **POST** /fake/refs/number | 
 [**object_model_with_ref_props**](FakeApi.md#object_model_with_ref_props) | **POST** /fake/refs/object_model_with_ref_props | 
+[**post_inline_additional_properties_payload**](FakeApi.md#post_inline_additional_properties_payload) | **POST** /fake/postInlineAdditionalPropertiesPayload | 
+[**post_inline_additional_properties_ref_payload**](FakeApi.md#post_inline_additional_properties_ref_payload) | **POST** /fake/postInlineAdditionalPropertiesRefPayload | 
 [**string**](FakeApi.md#string) | **POST** /fake/refs/string | 
 [**string_enum**](FakeApi.md#string_enum) | **POST** /fake/refs/enum | 
 [**test_body_with_file_schema**](FakeApi.md#test_body_with_file_schema) | **PUT** /fake/body-with-file-schema | 
@@ -564,148 +564,6 @@ No authorization required
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
-# **get_inline_additional_properties_payload**
-> InlineObject6 get_inline_additional_properties_payload()
-
-
-
-### Example
-
-```python
-import time
-import petstore_api
-from petstore_api.api import fake_api
-from petstore_api.model.inline_object6 import InlineObject6
-from pprint import pprint
-# Defining the host is optional and defaults to http://petstore.swagger.io:80/v2
-# See configuration.py for a list of all supported configuration parameters.
-configuration = petstore_api.Configuration(
-    host = "http://petstore.swagger.io:80/v2"
-)
-
-
-# Enter a context with an instance of the API client
-with petstore_api.ApiClient() as api_client:
-    # Create an instance of the API class
-    api_instance = fake_api.FakeApi(api_client)
-    inline_object6 = InlineObject6(
-        array_data=[
-            FakeGetInlineAdditionalPropertiesPayloadArrayData(
-                labels=[
-                    "labels_example",
-                ],
-            ),
-        ],
-    ) # InlineObject6 |  (optional)
-
-    # example passing only required values which don't have defaults set
-    # and optional values
-    try:
-        api_response = api_instance.get_inline_additional_properties_payload(inline_object6=inline_object6)
-        pprint(api_response)
-    except petstore_api.ApiException as e:
-        print("Exception when calling FakeApi->get_inline_additional_properties_payload: %s\n" % e)
-```
-
-
-### Parameters
-
-Name | Type | Description  | Notes
-------------- | ------------- | ------------- | -------------
- **inline_object6** | [**InlineObject6**](InlineObject6.md)|  | [optional]
-
-### Return type
-
-[**InlineObject6**](InlineObject6.md)
-
-### Authorization
-
-No authorization required
-
-### HTTP request headers
-
- - **Content-Type**: application/json
- - **Accept**: application/json
-
-
-### HTTP response details
-| Status code | Description | Response headers |
-|-------------|-------------|------------------|
-**200** | InlineAdditionalPropertiesPayload |  -  |
-
-[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
-
-# **get_inline_additional_properties_ref_payload**
-> InlineAdditionalPropertiesRefPayload get_inline_additional_properties_ref_payload()
-
-
-
-### Example
-
-```python
-import time
-import petstore_api
-from petstore_api.api import fake_api
-from petstore_api.model.inline_additional_properties_ref_payload import InlineAdditionalPropertiesRefPayload
-from pprint import pprint
-# Defining the host is optional and defaults to http://petstore.swagger.io:80/v2
-# See configuration.py for a list of all supported configuration parameters.
-configuration = petstore_api.Configuration(
-    host = "http://petstore.swagger.io:80/v2"
-)
-
-
-# Enter a context with an instance of the API client
-with petstore_api.ApiClient() as api_client:
-    # Create an instance of the API class
-    api_instance = fake_api.FakeApi(api_client)
-    inline_additional_properties_ref_payload = InlineAdditionalPropertiesRefPayload(
-        array_data=[
-            FakeGetInlineAdditionalPropertiesPayloadArrayData(
-                labels=[
-                    "labels_example",
-                ],
-            ),
-        ],
-    ) # InlineAdditionalPropertiesRefPayload |  (optional)
-
-    # example passing only required values which don't have defaults set
-    # and optional values
-    try:
-        api_response = api_instance.get_inline_additional_properties_ref_payload(inline_additional_properties_ref_payload=inline_additional_properties_ref_payload)
-        pprint(api_response)
-    except petstore_api.ApiException as e:
-        print("Exception when calling FakeApi->get_inline_additional_properties_ref_payload: %s\n" % e)
-```
-
-
-### Parameters
-
-Name | Type | Description  | Notes
-------------- | ------------- | ------------- | -------------
- **inline_additional_properties_ref_payload** | [**InlineAdditionalPropertiesRefPayload**](InlineAdditionalPropertiesRefPayload.md)|  | [optional]
-
-### Return type
-
-[**InlineAdditionalPropertiesRefPayload**](InlineAdditionalPropertiesRefPayload.md)
-
-### Authorization
-
-No authorization required
-
-### HTTP request headers
-
- - **Content-Type**: application/json
- - **Accept**: application/json
-
-
-### HTTP response details
-| Status code | Description | Response headers |
-|-------------|-------------|------------------|
-**200** | InlineAdditionalPropertiesRefPayload |  -  |
-
-[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
-
 # **mammal**
 > Mammal mammal(mammal)
 
@@ -908,6 +766,148 @@ No authorization required
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
+# **post_inline_additional_properties_payload**
+> InlineObject6 post_inline_additional_properties_payload()
+
+
+
+### Example
+
+```python
+import time
+import petstore_api
+from petstore_api.api import fake_api
+from petstore_api.model.inline_object6 import InlineObject6
+from pprint import pprint
+# Defining the host is optional and defaults to http://petstore.swagger.io:80/v2
+# See configuration.py for a list of all supported configuration parameters.
+configuration = petstore_api.Configuration(
+    host = "http://petstore.swagger.io:80/v2"
+)
+
+
+# Enter a context with an instance of the API client
+with petstore_api.ApiClient() as api_client:
+    # Create an instance of the API class
+    api_instance = fake_api.FakeApi(api_client)
+    inline_object6 = InlineObject6(
+        array_data=[
+            FakePostInlineAdditionalPropertiesPayloadArrayData(
+                labels=[
+                    "labels_example",
+                ],
+            ),
+        ],
+    ) # InlineObject6 |  (optional)
+
+    # example passing only required values which don't have defaults set
+    # and optional values
+    try:
+        api_response = api_instance.post_inline_additional_properties_payload(inline_object6=inline_object6)
+        pprint(api_response)
+    except petstore_api.ApiException as e:
+        print("Exception when calling FakeApi->post_inline_additional_properties_payload: %s\n" % e)
+```
+
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **inline_object6** | [**InlineObject6**](InlineObject6.md)|  | [optional]
+
+### Return type
+
+[**InlineObject6**](InlineObject6.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: application/json
+
+
+### HTTP response details
+| Status code | Description | Response headers |
+|-------------|-------------|------------------|
+**200** | InlineAdditionalPropertiesPayload |  -  |
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+# **post_inline_additional_properties_ref_payload**
+> InlineAdditionalPropertiesRefPayload post_inline_additional_properties_ref_payload()
+
+
+
+### Example
+
+```python
+import time
+import petstore_api
+from petstore_api.api import fake_api
+from petstore_api.model.inline_additional_properties_ref_payload import InlineAdditionalPropertiesRefPayload
+from pprint import pprint
+# Defining the host is optional and defaults to http://petstore.swagger.io:80/v2
+# See configuration.py for a list of all supported configuration parameters.
+configuration = petstore_api.Configuration(
+    host = "http://petstore.swagger.io:80/v2"
+)
+
+
+# Enter a context with an instance of the API client
+with petstore_api.ApiClient() as api_client:
+    # Create an instance of the API class
+    api_instance = fake_api.FakeApi(api_client)
+    inline_additional_properties_ref_payload = InlineAdditionalPropertiesRefPayload(
+        array_data=[
+            FakePostInlineAdditionalPropertiesPayloadArrayData(
+                labels=[
+                    "labels_example",
+                ],
+            ),
+        ],
+    ) # InlineAdditionalPropertiesRefPayload |  (optional)
+
+    # example passing only required values which don't have defaults set
+    # and optional values
+    try:
+        api_response = api_instance.post_inline_additional_properties_ref_payload(inline_additional_properties_ref_payload=inline_additional_properties_ref_payload)
+        pprint(api_response)
+    except petstore_api.ApiException as e:
+        print("Exception when calling FakeApi->post_inline_additional_properties_ref_payload: %s\n" % e)
+```
+
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **inline_additional_properties_ref_payload** | [**InlineAdditionalPropertiesRefPayload**](InlineAdditionalPropertiesRefPayload.md)|  | [optional]
+
+### Return type
+
+[**InlineAdditionalPropertiesRefPayload**](InlineAdditionalPropertiesRefPayload.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: application/json
+
+
+### HTTP response details
+| Status code | Description | Response headers |
+|-------------|-------------|------------------|
+**200** | InlineAdditionalPropertiesRefPayload |  -  |
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
 # **string**
 > str string()
 
diff --git a/samples/openapi3/client/petstore/python/docs/FakeGetInlineAdditionalPropertiesPayloadArrayData.md b/samples/openapi3/client/petstore/python/docs/FakePostInlineAdditionalPropertiesPayloadArrayData.md
similarity index 90%
rename from samples/openapi3/client/petstore/python/docs/FakeGetInlineAdditionalPropertiesPayloadArrayData.md
rename to samples/openapi3/client/petstore/python/docs/FakePostInlineAdditionalPropertiesPayloadArrayData.md
index 6c3418d8c079..23ec35f5dcd3 100644
--- a/samples/openapi3/client/petstore/python/docs/FakeGetInlineAdditionalPropertiesPayloadArrayData.md
+++ b/samples/openapi3/client/petstore/python/docs/FakePostInlineAdditionalPropertiesPayloadArrayData.md
@@ -1,4 +1,4 @@
-# FakeGetInlineAdditionalPropertiesPayloadArrayData
+# FakePostInlineAdditionalPropertiesPayloadArrayData
 
 
 ## Properties
diff --git a/samples/openapi3/client/petstore/python/docs/InlineAdditionalPropertiesRefPayload.md b/samples/openapi3/client/petstore/python/docs/InlineAdditionalPropertiesRefPayload.md
index 5922fc61f1a7..f99ed143d3f8 100644
--- a/samples/openapi3/client/petstore/python/docs/InlineAdditionalPropertiesRefPayload.md
+++ b/samples/openapi3/client/petstore/python/docs/InlineAdditionalPropertiesRefPayload.md
@@ -5,7 +5,7 @@ this payload is used for verification that some model_to_dict issues are fixed
 ## Properties
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**array_data** | [**[FakeGetInlineAdditionalPropertiesPayloadArrayData], none_type**](FakeGetInlineAdditionalPropertiesPayloadArrayData.md) |  | [optional] 
+**array_data** | [**[FakePostInlineAdditionalPropertiesPayloadArrayData], none_type**](FakePostInlineAdditionalPropertiesPayloadArrayData.md) |  | [optional] 
 **any string name** | **bool, date, datetime, dict, float, int, list, str, none_type** | any string name can be used but the value must be the correct type | [optional]
 
 [[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
diff --git a/samples/openapi3/client/petstore/python/docs/InlineObject6.md b/samples/openapi3/client/petstore/python/docs/InlineObject6.md
index fc83501c1546..b4a7a55a2c7f 100644
--- a/samples/openapi3/client/petstore/python/docs/InlineObject6.md
+++ b/samples/openapi3/client/petstore/python/docs/InlineObject6.md
@@ -5,7 +5,7 @@ this payload is used for verification that some model_to_dict issues are fixed
 ## Properties
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**array_data** | [**[FakeGetInlineAdditionalPropertiesPayloadArrayData], none_type**](FakeGetInlineAdditionalPropertiesPayloadArrayData.md) |  | [optional] 
+**array_data** | [**[FakePostInlineAdditionalPropertiesPayloadArrayData], none_type**](FakePostInlineAdditionalPropertiesPayloadArrayData.md) |  | [optional] 
 **any string name** | **bool, date, datetime, dict, float, int, list, str, none_type** | any string name can be used but the value must be the correct type | [optional]
 
 [[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
diff --git a/samples/openapi3/client/petstore/python/petstore_api/api/fake_api.py b/samples/openapi3/client/petstore/python/petstore_api/api/fake_api.py
index 27a387e05701..7dea3785aecd 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/api/fake_api.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/api/fake_api.py
@@ -945,228 +945,6 @@ class FakeApi(object):
             callable=__fake_health_get
         )
 
-        def __get_inline_additional_properties_payload(
-            self,
-            **kwargs
-        ):
-            """get_inline_additional_properties_payload  # noqa: E501
-
-            This method makes a synchronous HTTP request by default. To make an
-            asynchronous HTTP request, please pass async_req=True
-
-            >>> thread = api.get_inline_additional_properties_payload(async_req=True)
-            >>> result = thread.get()
-
-
-            Keyword Args:
-                inline_object6 (InlineObject6): [optional]
-                _return_http_data_only (bool): response data without head status
-                    code and headers. Default is True.
-                _preload_content (bool): if False, the urllib3.HTTPResponse object
-                    will be returned without reading/decoding response data.
-                    Default is True.
-                _request_timeout (float/tuple): timeout setting for this request. If one
-                    number provided, it will be total request timeout. It can also
-                    be a pair (tuple) of (connection, read) timeouts.
-                    Default is None.
-                _check_input_type (bool): specifies if type checking
-                    should be done one the data sent to the server.
-                    Default is True.
-                _check_return_type (bool): specifies if type checking
-                    should be done one the data received from the server.
-                    Default is True.
-                _host_index (int/None): specifies the index of the server
-                    that we want to use.
-                    Default is read from the configuration.
-                async_req (bool): execute request asynchronously
-
-            Returns:
-                InlineObject6
-                    If the method is called asynchronously, returns the request
-                    thread.
-            """
-            kwargs['async_req'] = kwargs.get(
-                'async_req', False
-            )
-            kwargs['_return_http_data_only'] = kwargs.get(
-                '_return_http_data_only', True
-            )
-            kwargs['_preload_content'] = kwargs.get(
-                '_preload_content', True
-            )
-            kwargs['_request_timeout'] = kwargs.get(
-                '_request_timeout', None
-            )
-            kwargs['_check_input_type'] = kwargs.get(
-                '_check_input_type', True
-            )
-            kwargs['_check_return_type'] = kwargs.get(
-                '_check_return_type', True
-            )
-            kwargs['_host_index'] = kwargs.get('_host_index')
-            return self.call_with_http_info(**kwargs)
-
-        self.get_inline_additional_properties_payload = _Endpoint(
-            settings={
-                'response_type': (InlineObject6,),
-                'auth': [],
-                'endpoint_path': '/fake/getInlineAdditionalPropertiesPayload',
-                'operation_id': 'get_inline_additional_properties_payload',
-                'http_method': 'GET',
-                'servers': None,
-            },
-            params_map={
-                'all': [
-                    'inline_object6',
-                ],
-                'required': [],
-                'nullable': [
-                ],
-                'enum': [
-                ],
-                'validation': [
-                ]
-            },
-            root_map={
-                'validations': {
-                },
-                'allowed_values': {
-                },
-                'openapi_types': {
-                    'inline_object6':
-                        (InlineObject6,),
-                },
-                'attribute_map': {
-                },
-                'location_map': {
-                    'inline_object6': 'body',
-                },
-                'collection_format_map': {
-                }
-            },
-            headers_map={
-                'accept': [
-                    'application/json'
-                ],
-                'content_type': [
-                    'application/json'
-                ]
-            },
-            api_client=api_client,
-            callable=__get_inline_additional_properties_payload
-        )
-
-        def __get_inline_additional_properties_ref_payload(
-            self,
-            **kwargs
-        ):
-            """get_inline_additional_properties_ref_payload  # noqa: E501
-
-            This method makes a synchronous HTTP request by default. To make an
-            asynchronous HTTP request, please pass async_req=True
-
-            >>> thread = api.get_inline_additional_properties_ref_payload(async_req=True)
-            >>> result = thread.get()
-
-
-            Keyword Args:
-                inline_additional_properties_ref_payload (InlineAdditionalPropertiesRefPayload): [optional]
-                _return_http_data_only (bool): response data without head status
-                    code and headers. Default is True.
-                _preload_content (bool): if False, the urllib3.HTTPResponse object
-                    will be returned without reading/decoding response data.
-                    Default is True.
-                _request_timeout (float/tuple): timeout setting for this request. If one
-                    number provided, it will be total request timeout. It can also
-                    be a pair (tuple) of (connection, read) timeouts.
-                    Default is None.
-                _check_input_type (bool): specifies if type checking
-                    should be done one the data sent to the server.
-                    Default is True.
-                _check_return_type (bool): specifies if type checking
-                    should be done one the data received from the server.
-                    Default is True.
-                _host_index (int/None): specifies the index of the server
-                    that we want to use.
-                    Default is read from the configuration.
-                async_req (bool): execute request asynchronously
-
-            Returns:
-                InlineAdditionalPropertiesRefPayload
-                    If the method is called asynchronously, returns the request
-                    thread.
-            """
-            kwargs['async_req'] = kwargs.get(
-                'async_req', False
-            )
-            kwargs['_return_http_data_only'] = kwargs.get(
-                '_return_http_data_only', True
-            )
-            kwargs['_preload_content'] = kwargs.get(
-                '_preload_content', True
-            )
-            kwargs['_request_timeout'] = kwargs.get(
-                '_request_timeout', None
-            )
-            kwargs['_check_input_type'] = kwargs.get(
-                '_check_input_type', True
-            )
-            kwargs['_check_return_type'] = kwargs.get(
-                '_check_return_type', True
-            )
-            kwargs['_host_index'] = kwargs.get('_host_index')
-            return self.call_with_http_info(**kwargs)
-
-        self.get_inline_additional_properties_ref_payload = _Endpoint(
-            settings={
-                'response_type': (InlineAdditionalPropertiesRefPayload,),
-                'auth': [],
-                'endpoint_path': '/fake/getInlineAdditionalPropertiesRefPayload',
-                'operation_id': 'get_inline_additional_properties_ref_payload',
-                'http_method': 'GET',
-                'servers': None,
-            },
-            params_map={
-                'all': [
-                    'inline_additional_properties_ref_payload',
-                ],
-                'required': [],
-                'nullable': [
-                ],
-                'enum': [
-                ],
-                'validation': [
-                ]
-            },
-            root_map={
-                'validations': {
-                },
-                'allowed_values': {
-                },
-                'openapi_types': {
-                    'inline_additional_properties_ref_payload':
-                        (InlineAdditionalPropertiesRefPayload,),
-                },
-                'attribute_map': {
-                },
-                'location_map': {
-                    'inline_additional_properties_ref_payload': 'body',
-                },
-                'collection_format_map': {
-                }
-            },
-            headers_map={
-                'accept': [
-                    'application/json'
-                ],
-                'content_type': [
-                    'application/json'
-                ]
-            },
-            api_client=api_client,
-            callable=__get_inline_additional_properties_ref_payload
-        )
-
         def __mammal(
             self,
             mammal,
@@ -1509,6 +1287,228 @@ class FakeApi(object):
             callable=__object_model_with_ref_props
         )
 
+        def __post_inline_additional_properties_payload(
+            self,
+            **kwargs
+        ):
+            """post_inline_additional_properties_payload  # noqa: E501
+
+            This method makes a synchronous HTTP request by default. To make an
+            asynchronous HTTP request, please pass async_req=True
+
+            >>> thread = api.post_inline_additional_properties_payload(async_req=True)
+            >>> result = thread.get()
+
+
+            Keyword Args:
+                inline_object6 (InlineObject6): [optional]
+                _return_http_data_only (bool): response data without head status
+                    code and headers. Default is True.
+                _preload_content (bool): if False, the urllib3.HTTPResponse object
+                    will be returned without reading/decoding response data.
+                    Default is True.
+                _request_timeout (float/tuple): timeout setting for this request. If one
+                    number provided, it will be total request timeout. It can also
+                    be a pair (tuple) of (connection, read) timeouts.
+                    Default is None.
+                _check_input_type (bool): specifies if type checking
+                    should be done one the data sent to the server.
+                    Default is True.
+                _check_return_type (bool): specifies if type checking
+                    should be done one the data received from the server.
+                    Default is True.
+                _host_index (int/None): specifies the index of the server
+                    that we want to use.
+                    Default is read from the configuration.
+                async_req (bool): execute request asynchronously
+
+            Returns:
+                InlineObject6
+                    If the method is called asynchronously, returns the request
+                    thread.
+            """
+            kwargs['async_req'] = kwargs.get(
+                'async_req', False
+            )
+            kwargs['_return_http_data_only'] = kwargs.get(
+                '_return_http_data_only', True
+            )
+            kwargs['_preload_content'] = kwargs.get(
+                '_preload_content', True
+            )
+            kwargs['_request_timeout'] = kwargs.get(
+                '_request_timeout', None
+            )
+            kwargs['_check_input_type'] = kwargs.get(
+                '_check_input_type', True
+            )
+            kwargs['_check_return_type'] = kwargs.get(
+                '_check_return_type', True
+            )
+            kwargs['_host_index'] = kwargs.get('_host_index')
+            return self.call_with_http_info(**kwargs)
+
+        self.post_inline_additional_properties_payload = _Endpoint(
+            settings={
+                'response_type': (InlineObject6,),
+                'auth': [],
+                'endpoint_path': '/fake/postInlineAdditionalPropertiesPayload',
+                'operation_id': 'post_inline_additional_properties_payload',
+                'http_method': 'POST',
+                'servers': None,
+            },
+            params_map={
+                'all': [
+                    'inline_object6',
+                ],
+                'required': [],
+                'nullable': [
+                ],
+                'enum': [
+                ],
+                'validation': [
+                ]
+            },
+            root_map={
+                'validations': {
+                },
+                'allowed_values': {
+                },
+                'openapi_types': {
+                    'inline_object6':
+                        (InlineObject6,),
+                },
+                'attribute_map': {
+                },
+                'location_map': {
+                    'inline_object6': 'body',
+                },
+                'collection_format_map': {
+                }
+            },
+            headers_map={
+                'accept': [
+                    'application/json'
+                ],
+                'content_type': [
+                    'application/json'
+                ]
+            },
+            api_client=api_client,
+            callable=__post_inline_additional_properties_payload
+        )
+
+        def __post_inline_additional_properties_ref_payload(
+            self,
+            **kwargs
+        ):
+            """post_inline_additional_properties_ref_payload  # noqa: E501
+
+            This method makes a synchronous HTTP request by default. To make an
+            asynchronous HTTP request, please pass async_req=True
+
+            >>> thread = api.post_inline_additional_properties_ref_payload(async_req=True)
+            >>> result = thread.get()
+
+
+            Keyword Args:
+                inline_additional_properties_ref_payload (InlineAdditionalPropertiesRefPayload): [optional]
+                _return_http_data_only (bool): response data without head status
+                    code and headers. Default is True.
+                _preload_content (bool): if False, the urllib3.HTTPResponse object
+                    will be returned without reading/decoding response data.
+                    Default is True.
+                _request_timeout (float/tuple): timeout setting for this request. If one
+                    number provided, it will be total request timeout. It can also
+                    be a pair (tuple) of (connection, read) timeouts.
+                    Default is None.
+                _check_input_type (bool): specifies if type checking
+                    should be done one the data sent to the server.
+                    Default is True.
+                _check_return_type (bool): specifies if type checking
+                    should be done one the data received from the server.
+                    Default is True.
+                _host_index (int/None): specifies the index of the server
+                    that we want to use.
+                    Default is read from the configuration.
+                async_req (bool): execute request asynchronously
+
+            Returns:
+                InlineAdditionalPropertiesRefPayload
+                    If the method is called asynchronously, returns the request
+                    thread.
+            """
+            kwargs['async_req'] = kwargs.get(
+                'async_req', False
+            )
+            kwargs['_return_http_data_only'] = kwargs.get(
+                '_return_http_data_only', True
+            )
+            kwargs['_preload_content'] = kwargs.get(
+                '_preload_content', True
+            )
+            kwargs['_request_timeout'] = kwargs.get(
+                '_request_timeout', None
+            )
+            kwargs['_check_input_type'] = kwargs.get(
+                '_check_input_type', True
+            )
+            kwargs['_check_return_type'] = kwargs.get(
+                '_check_return_type', True
+            )
+            kwargs['_host_index'] = kwargs.get('_host_index')
+            return self.call_with_http_info(**kwargs)
+
+        self.post_inline_additional_properties_ref_payload = _Endpoint(
+            settings={
+                'response_type': (InlineAdditionalPropertiesRefPayload,),
+                'auth': [],
+                'endpoint_path': '/fake/postInlineAdditionalPropertiesRefPayload',
+                'operation_id': 'post_inline_additional_properties_ref_payload',
+                'http_method': 'POST',
+                'servers': None,
+            },
+            params_map={
+                'all': [
+                    'inline_additional_properties_ref_payload',
+                ],
+                'required': [],
+                'nullable': [
+                ],
+                'enum': [
+                ],
+                'validation': [
+                ]
+            },
+            root_map={
+                'validations': {
+                },
+                'allowed_values': {
+                },
+                'openapi_types': {
+                    'inline_additional_properties_ref_payload':
+                        (InlineAdditionalPropertiesRefPayload,),
+                },
+                'attribute_map': {
+                },
+                'location_map': {
+                    'inline_additional_properties_ref_payload': 'body',
+                },
+                'collection_format_map': {
+                }
+            },
+            headers_map={
+                'accept': [
+                    'application/json'
+                ],
+                'content_type': [
+                    'application/json'
+                ]
+            },
+            api_client=api_client,
+            callable=__post_inline_additional_properties_ref_payload
+        )
+
         def __string(
             self,
             **kwargs
diff --git a/samples/openapi3/client/petstore/python/petstore_api/model/fake_get_inline_additional_properties_payload_array_data.py b/samples/openapi3/client/petstore/python/petstore_api/model/fake_post_inline_additional_properties_payload_array_data.py
similarity index 97%
rename from samples/openapi3/client/petstore/python/petstore_api/model/fake_get_inline_additional_properties_payload_array_data.py
rename to samples/openapi3/client/petstore/python/petstore_api/model/fake_post_inline_additional_properties_payload_array_data.py
index 71b921c921fb..bf9761b084c7 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/model/fake_get_inline_additional_properties_payload_array_data.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/model/fake_post_inline_additional_properties_payload_array_data.py
@@ -30,7 +30,7 @@ from petstore_api.exceptions import ApiAttributeError
 
 
 
-class FakeGetInlineAdditionalPropertiesPayloadArrayData(ModelNormal):
+class FakePostInlineAdditionalPropertiesPayloadArrayData(ModelNormal):
     """NOTE: This class is auto generated by OpenAPI Generator.
     Ref: https://openapi-generator.tech
 
@@ -101,7 +101,7 @@ class FakeGetInlineAdditionalPropertiesPayloadArrayData(ModelNormal):
     @classmethod
     @convert_js_args_to_python_args
     def _from_openapi_data(cls, *args, **kwargs):  # noqa: E501
-        """FakeGetInlineAdditionalPropertiesPayloadArrayData - a model defined in OpenAPI
+        """FakePostInlineAdditionalPropertiesPayloadArrayData - a model defined in OpenAPI
 
         Keyword Args:
             _check_type (bool): if True, values for parameters in openapi_types
@@ -183,7 +183,7 @@ class FakeGetInlineAdditionalPropertiesPayloadArrayData(ModelNormal):
 
     @convert_js_args_to_python_args
     def __init__(self, *args, **kwargs):  # noqa: E501
-        """FakeGetInlineAdditionalPropertiesPayloadArrayData - a model defined in OpenAPI
+        """FakePostInlineAdditionalPropertiesPayloadArrayData - a model defined in OpenAPI
 
         Keyword Args:
             _check_type (bool): if True, values for parameters in openapi_types
diff --git a/samples/openapi3/client/petstore/python/petstore_api/model/inline_additional_properties_ref_payload.py b/samples/openapi3/client/petstore/python/petstore_api/model/inline_additional_properties_ref_payload.py
index 4ba519ea0aff..85d3fa5922f1 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/model/inline_additional_properties_ref_payload.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/model/inline_additional_properties_ref_payload.py
@@ -30,8 +30,8 @@ from petstore_api.exceptions import ApiAttributeError
 
 
 def lazy_import():
-    from petstore_api.model.fake_get_inline_additional_properties_payload_array_data import FakeGetInlineAdditionalPropertiesPayloadArrayData
-    globals()['FakeGetInlineAdditionalPropertiesPayloadArrayData'] = FakeGetInlineAdditionalPropertiesPayloadArrayData
+    from petstore_api.model.fake_post_inline_additional_properties_payload_array_data import FakePostInlineAdditionalPropertiesPayloadArrayData
+    globals()['FakePostInlineAdditionalPropertiesPayloadArrayData'] = FakePostInlineAdditionalPropertiesPayloadArrayData
 
 
 class InlineAdditionalPropertiesRefPayload(ModelNormal):
@@ -87,7 +87,7 @@ class InlineAdditionalPropertiesRefPayload(ModelNormal):
         """
         lazy_import()
         return {
-            'array_data': ([FakeGetInlineAdditionalPropertiesPayloadArrayData], none_type,),  # noqa: E501
+            'array_data': ([FakePostInlineAdditionalPropertiesPayloadArrayData], none_type,),  # noqa: E501
         }
 
     @cached_property
@@ -140,7 +140,7 @@ class InlineAdditionalPropertiesRefPayload(ModelNormal):
                                 Animal class but this time we won't travel
                                 through its discriminator because we passed in
                                 _visited_composed_classes = (Animal,)
-            array_data ([FakeGetInlineAdditionalPropertiesPayloadArrayData], none_type): [optional]  # noqa: E501
+            array_data ([FakePostInlineAdditionalPropertiesPayloadArrayData], none_type): [optional]  # noqa: E501
         """
 
         _check_type = kwargs.pop('_check_type', True)
@@ -222,7 +222,7 @@ class InlineAdditionalPropertiesRefPayload(ModelNormal):
                                 Animal class but this time we won't travel
                                 through its discriminator because we passed in
                                 _visited_composed_classes = (Animal,)
-            array_data ([FakeGetInlineAdditionalPropertiesPayloadArrayData], none_type): [optional]  # noqa: E501
+            array_data ([FakePostInlineAdditionalPropertiesPayloadArrayData], none_type): [optional]  # noqa: E501
         """
 
         _check_type = kwargs.pop('_check_type', True)
diff --git a/samples/openapi3/client/petstore/python/petstore_api/model/inline_object6.py b/samples/openapi3/client/petstore/python/petstore_api/model/inline_object6.py
index dbbd376e1250..828d30aa0762 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/model/inline_object6.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/model/inline_object6.py
@@ -30,8 +30,8 @@ from petstore_api.exceptions import ApiAttributeError
 
 
 def lazy_import():
-    from petstore_api.model.fake_get_inline_additional_properties_payload_array_data import FakeGetInlineAdditionalPropertiesPayloadArrayData
-    globals()['FakeGetInlineAdditionalPropertiesPayloadArrayData'] = FakeGetInlineAdditionalPropertiesPayloadArrayData
+    from petstore_api.model.fake_post_inline_additional_properties_payload_array_data import FakePostInlineAdditionalPropertiesPayloadArrayData
+    globals()['FakePostInlineAdditionalPropertiesPayloadArrayData'] = FakePostInlineAdditionalPropertiesPayloadArrayData
 
 
 class InlineObject6(ModelNormal):
@@ -87,7 +87,7 @@ class InlineObject6(ModelNormal):
         """
         lazy_import()
         return {
-            'array_data': ([FakeGetInlineAdditionalPropertiesPayloadArrayData], none_type,),  # noqa: E501
+            'array_data': ([FakePostInlineAdditionalPropertiesPayloadArrayData], none_type,),  # noqa: E501
         }
 
     @cached_property
@@ -140,7 +140,7 @@ class InlineObject6(ModelNormal):
                                 Animal class but this time we won't travel
                                 through its discriminator because we passed in
                                 _visited_composed_classes = (Animal,)
-            array_data ([FakeGetInlineAdditionalPropertiesPayloadArrayData], none_type): [optional]  # noqa: E501
+            array_data ([FakePostInlineAdditionalPropertiesPayloadArrayData], none_type): [optional]  # noqa: E501
         """
 
         _check_type = kwargs.pop('_check_type', True)
@@ -222,7 +222,7 @@ class InlineObject6(ModelNormal):
                                 Animal class but this time we won't travel
                                 through its discriminator because we passed in
                                 _visited_composed_classes = (Animal,)
-            array_data ([FakeGetInlineAdditionalPropertiesPayloadArrayData], none_type): [optional]  # noqa: E501
+            array_data ([FakePostInlineAdditionalPropertiesPayloadArrayData], none_type): [optional]  # noqa: E501
         """
 
         _check_type = kwargs.pop('_check_type', True)
diff --git a/samples/openapi3/client/petstore/python/petstore_api/model_utils.py b/samples/openapi3/client/petstore/python/petstore_api/model_utils.py
index 3913228d6b89..97f9b2881cc5 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/model_utils.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/model_utils.py
@@ -1632,12 +1632,20 @@ def model_to_dict(model_instance, serialize=True):
     model_instances = [model_instance]
     if model_instance._composed_schemas:
         model_instances.extend(model_instance._composed_instances)
+    seen_json_attribute_names = set()
+    used_fallback_python_attribute_names = set()
+    py_to_json_map = {}
     for model_instance in model_instances:
         for attr, value in model_instance._data_store.items():
             if serialize:
                 # we use get here because additional property key names do not
                 # exist in attribute_map
-                attr = model_instance.attribute_map.get(attr, attr)
+                try:
+                    attr = model_instance.attribute_map[attr]
+                    py_to_json_map.update(model_instance.attribute_map)
+                    seen_json_attribute_names.add(attr)
+                except KeyError:
+                    used_fallback_python_attribute_names.add(attr)
             if isinstance(value, list):
                if not value:
                    # empty list or None
@@ -1665,6 +1673,16 @@ def model_to_dict(model_instance, serialize=True):
                 result[attr] = model_to_dict(value, serialize=serialize)
             else:
                 result[attr] = value
+    if serialize:
+        for python_key in used_fallback_python_attribute_names:
+            json_key = py_to_json_map.get(python_key)
+            if json_key is None:
+                continue
+            if python_key == json_key:
+                continue
+            json_key_assigned_no_need_for_python_key = json_key in seen_json_attribute_names
+            if json_key_assigned_no_need_for_python_key:
+                del result[python_key]
 
     return result
 
diff --git a/samples/openapi3/client/petstore/python/petstore_api/models/__init__.py b/samples/openapi3/client/petstore/python/petstore_api/models/__init__.py
index f18e33defce6..9485a03d2f88 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/models/__init__.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/models/__init__.py
@@ -43,7 +43,7 @@ from petstore_api.model.enum_arrays import EnumArrays
 from petstore_api.model.enum_class import EnumClass
 from petstore_api.model.enum_test import EnumTest
 from petstore_api.model.equilateral_triangle import EquilateralTriangle
-from petstore_api.model.fake_get_inline_additional_properties_payload_array_data import FakeGetInlineAdditionalPropertiesPayloadArrayData
+from petstore_api.model.fake_post_inline_additional_properties_payload_array_data import FakePostInlineAdditionalPropertiesPayloadArrayData
 from petstore_api.model.file import File
 from petstore_api.model.file_schema_test_class import FileSchemaTestClass
 from petstore_api.model.foo import Foo
diff --git a/samples/openapi3/client/petstore/python/test/test_fake_get_inline_additional_properties_payload_array_data.py b/samples/openapi3/client/petstore/python/test/test_fake_post_inline_additional_properties_payload_array_data.py
similarity index 52%
rename from samples/openapi3/client/petstore/python/test/test_fake_get_inline_additional_properties_payload_array_data.py
rename to samples/openapi3/client/petstore/python/test/test_fake_post_inline_additional_properties_payload_array_data.py
index 2e95eb37dffc..6b4be44e865d 100644
--- a/samples/openapi3/client/petstore/python/test/test_fake_get_inline_additional_properties_payload_array_data.py
+++ b/samples/openapi3/client/petstore/python/test/test_fake_post_inline_additional_properties_payload_array_data.py
@@ -12,11 +12,11 @@ import sys
 import unittest
 
 import petstore_api
-from petstore_api.model.fake_get_inline_additional_properties_payload_array_data import FakeGetInlineAdditionalPropertiesPayloadArrayData
+from petstore_api.model.fake_post_inline_additional_properties_payload_array_data import FakePostInlineAdditionalPropertiesPayloadArrayData
 
 
-class TestFakeGetInlineAdditionalPropertiesPayloadArrayData(unittest.TestCase):
-    """FakeGetInlineAdditionalPropertiesPayloadArrayData unit test stubs"""
+class TestFakePostInlineAdditionalPropertiesPayloadArrayData(unittest.TestCase):
+    """FakePostInlineAdditionalPropertiesPayloadArrayData unit test stubs"""
 
     def setUp(self):
         pass
@@ -24,10 +24,10 @@ class TestFakeGetInlineAdditionalPropertiesPayloadArrayData(unittest.TestCase):
     def tearDown(self):
         pass
 
-    def testFakeGetInlineAdditionalPropertiesPayloadArrayData(self):
-        """Test FakeGetInlineAdditionalPropertiesPayloadArrayData"""
+    def testFakePostInlineAdditionalPropertiesPayloadArrayData(self):
+        """Test FakePostInlineAdditionalPropertiesPayloadArrayData"""
         # FIXME: construct object with mandatory attributes with example values
-        # model = FakeGetInlineAdditionalPropertiesPayloadArrayData()  # noqa: E501
+        # model = FakePostInlineAdditionalPropertiesPayloadArrayData()  # noqa: E501
         pass
 
 
diff --git a/samples/openapi3/client/petstore/python/test/test_inline_additional_properties_ref_payload.py b/samples/openapi3/client/petstore/python/test/test_inline_additional_properties_ref_payload.py
index 709ee27adc89..7e8cf543335f 100644
--- a/samples/openapi3/client/petstore/python/test/test_inline_additional_properties_ref_payload.py
+++ b/samples/openapi3/client/petstore/python/test/test_inline_additional_properties_ref_payload.py
@@ -12,8 +12,8 @@ import sys
 import unittest
 
 import petstore_api
-from petstore_api.model.fake_get_inline_additional_properties_payload_array_data import FakeGetInlineAdditionalPropertiesPayloadArrayData
-globals()['FakeGetInlineAdditionalPropertiesPayloadArrayData'] = FakeGetInlineAdditionalPropertiesPayloadArrayData
+from petstore_api.model.fake_post_inline_additional_properties_payload_array_data import FakePostInlineAdditionalPropertiesPayloadArrayData
+globals()['FakePostInlineAdditionalPropertiesPayloadArrayData'] = FakePostInlineAdditionalPropertiesPayloadArrayData
 from petstore_api.model.inline_additional_properties_ref_payload import InlineAdditionalPropertiesRefPayload
 
 
diff --git a/samples/openapi3/client/petstore/python/test/test_inline_object6.py b/samples/openapi3/client/petstore/python/test/test_inline_object6.py
index 463123d8e558..887e5689b9ad 100644
--- a/samples/openapi3/client/petstore/python/test/test_inline_object6.py
+++ b/samples/openapi3/client/petstore/python/test/test_inline_object6.py
@@ -12,8 +12,8 @@ import sys
 import unittest
 
 import petstore_api
-from petstore_api.model.fake_get_inline_additional_properties_payload_array_data import FakeGetInlineAdditionalPropertiesPayloadArrayData
-globals()['FakeGetInlineAdditionalPropertiesPayloadArrayData'] = FakeGetInlineAdditionalPropertiesPayloadArrayData
+from petstore_api.model.fake_post_inline_additional_properties_payload_array_data import FakePostInlineAdditionalPropertiesPayloadArrayData
+globals()['FakePostInlineAdditionalPropertiesPayloadArrayData'] = FakePostInlineAdditionalPropertiesPayloadArrayData
 from petstore_api.model.inline_object6 import InlineObject6
 
 
diff --git a/samples/openapi3/client/petstore/python/tests_manual/test_fake_api.py b/samples/openapi3/client/petstore/python/tests_manual/test_fake_api.py
index 8c0886e373b6..954f1ce8e5c2 100644
--- a/samples/openapi3/client/petstore/python/tests_manual/test_fake_api.py
+++ b/samples/openapi3/client/petstore/python/tests_manual/test_fake_api.py
@@ -19,7 +19,7 @@ from unittest.mock import patch
 import petstore_api
 from petstore_api.api.fake_api import FakeApi  # noqa: E501
 from petstore_api.rest import RESTClientObject, RESTResponse
-from petstore_api.model_utils import file_type
+from petstore_api.model_utils import file_type, model_to_dict
 
 HTTPResponse = namedtuple(
     'urllib3_response_HTTPResponse',
@@ -59,14 +59,15 @@ class TestFakeApi(unittest.TestCase):
         url,
         accept='application/json',
         http_method='POST',
+        content_type='application/json',
         **kwargs
     ):
         headers = {
             'Accept': accept,
             'User-Agent': 'OpenAPI-Generator/1.0.0/python',
         }
-        if 'content_type' in kwargs:
-            headers['Content-Type'] = kwargs['content_type']
+        if content_type:
+            headers['Content-Type'] = content_type
         used_kwargs = dict(
             _preload_content=True,
             _request_timeout=None,
@@ -77,12 +78,13 @@ class TestFakeApi(unittest.TestCase):
             used_kwargs['post_params'] = kwargs['post_params']
         if 'body' in kwargs:
             used_kwargs['body'] = kwargs['body']
-        else:
-            mock_method.assert_called_with(
-                http_method,
-                url,
-                **used_kwargs
-            )
+            if 'post_params' not in used_kwargs:
+                used_kwargs['post_params'] = []
+        mock_method.assert_called_with(
+            http_method,
+            url,
+            **used_kwargs
+        )
 
     def test_array_model(self):
         """Test case for array_model
@@ -101,7 +103,11 @@ class TestFakeApi(unittest.TestCase):
             mock_method.return_value = self.mock_response(json_data)
 
             response = endpoint(body=body)
-            self.assert_request_called_with(mock_method, 'http://petstore.swagger.io:80/v2/fake/refs/arraymodel', body=json_data)
+            self.assert_request_called_with(
+                mock_method,
+                'http://petstore.swagger.io:80/v2/fake/refs/arraymodel',
+                body=json_data,
+            )
 
             assert isinstance(response, animal_farm.AnimalFarm)
             assert response == body
@@ -158,7 +164,10 @@ class TestFakeApi(unittest.TestCase):
 
             response = endpoint(enum_test=body)
             self.assert_request_called_with(
-                mock_method, 'http://petstore.swagger.io:80/v2/fake/refs/enum-test', body=json_value)
+                mock_method,
+                'http://petstore.swagger.io:80/v2/fake/refs/enum-test',
+                body=json_value,
+            )
 
             assert isinstance(response, EnumTest)
             assert response == body
@@ -174,7 +183,10 @@ class TestFakeApi(unittest.TestCase):
 
             response = endpoint(enum_test=body)
             self.assert_request_called_with(
-                mock_method, 'http://petstore.swagger.io:80/v2/fake/refs/enum-test', body=json_value)
+                mock_method,
+                'http://petstore.swagger.io:80/v2/fake/refs/enum-test',
+                body=json_value,
+            )
 
             assert isinstance(response, EnumTest)
             assert response == body
@@ -198,7 +210,11 @@ class TestFakeApi(unittest.TestCase):
             mock_method.return_value = self.mock_response(value_simple)
 
             response = endpoint(array_of_enums=body)
-            self.assert_request_called_with(mock_method, 'http://petstore.swagger.io:80/v2/fake/refs/array-of-enums', body=value_simple)
+            self.assert_request_called_with(
+                mock_method,
+                'http://petstore.swagger.io:80/v2/fake/refs/array-of-enums',
+                body=value_simple,
+            )
 
             assert isinstance(response, array_of_enums.ArrayOfEnums)
             assert response.value == value
@@ -219,7 +235,11 @@ class TestFakeApi(unittest.TestCase):
             mock_method.return_value = self.mock_response(value)
 
             response = endpoint(body=body)
-            self.assert_request_called_with(mock_method, 'http://petstore.swagger.io:80/v2/fake/refs/number', body=value)
+            self.assert_request_called_with(
+                mock_method,
+                'http://petstore.swagger.io:80/v2/fake/refs/number',
+                body=value,
+            )
 
             assert isinstance(response, number_with_validations.NumberWithValidations)
             assert response.value == value
@@ -262,7 +282,7 @@ class TestFakeApi(unittest.TestCase):
                 self.assert_request_called_with(
                     mock_method,
                     'http://petstore.swagger.io:80/v2/fake/refs/object_model_with_ref_props',
-                    body=json_payload
+                    body=json_payload,
                 )
 
                 assert isinstance(response, expected_model.__class__)
@@ -300,7 +320,7 @@ class TestFakeApi(unittest.TestCase):
                 self.assert_request_called_with(
                     mock_method,
                     'http://petstore.swagger.io:80/v2/fake/refs/composed_one_of_number_with_validations',
-                    body=value_simple
+                    body=value_simple,
                 )
 
                 assert isinstance(response, body.__class__)
@@ -321,7 +341,11 @@ class TestFakeApi(unittest.TestCase):
             mock_method.return_value = self.mock_response(value_simple)
 
             response = endpoint(body=body)
-            self.assert_request_called_with(mock_method, 'http://petstore.swagger.io:80/v2/fake/refs/string', body=value_simple)
+            self.assert_request_called_with(
+                mock_method,
+                'http://petstore.swagger.io:80/v2/fake/refs/string',
+                body=value_simple,
+            )
 
             assert isinstance(response, str)
             assert response == value_simple
@@ -343,7 +367,11 @@ class TestFakeApi(unittest.TestCase):
             mock_method.return_value = self.mock_response(value)
 
             response = endpoint(body=body)
-            self.assert_request_called_with(mock_method, 'http://petstore.swagger.io:80/v2/fake/refs/enum', body=value)
+            self.assert_request_called_with(
+                mock_method,
+                'http://petstore.swagger.io:80/v2/fake/refs/enum',
+                body=value,
+            )
 
             assert isinstance(response, string_enum.StringEnum)
             assert response.value == value
@@ -495,6 +523,7 @@ class TestFakeApi(unittest.TestCase):
                     'http://www.jtricks.com/download-text',
                     http_method='GET',
                     accept='text/plain',
+                    content_type=None,
                 )
                 self.assertTrue(isinstance(file_object, file_type))
                 self.assertFalse(file_object.closed)
@@ -532,8 +561,11 @@ class TestFakeApi(unittest.TestCase):
                 self.assert_request_called_with(
                     mock_method,
                     'http://petstore.swagger.io:80/v2/fake/uploadDownloadFile',
-                    body=expected_file_data, content_type='application/octet-stream'
+                    body=expected_file_data,
+                    content_type='application/octet-stream',
+                    accept='application/octet-stream'
                 )
+
                 self.assertTrue(isinstance(downloaded_file, file_type))
                 self.assertFalse(downloaded_file.closed)
                 self.assertEqual(downloaded_file.read(), expected_file_data)
@@ -604,12 +636,12 @@ class TestFakeApi(unittest.TestCase):
         """
         pass
 
-    def test_get_inline_additional_properties_ref_payload(self):
-        """Test case for getInlineAdditionlPropertiesRefPayload
+    def test_post_inline_additional_properties_ref_payload(self):
+        """Test case for postInlineAdditionlPropertiesRefPayload
         """
         from petstore_api.model.inline_additional_properties_ref_payload import InlineAdditionalPropertiesRefPayload
-        from petstore_api.model.fake_get_inline_additional_properties_payload_array_data import FakeGetInlineAdditionalPropertiesPayloadArrayData
-        endpoint = self.api.get_inline_additional_properties_ref_payload
+        from petstore_api.model.fake_post_inline_additional_properties_payload_array_data import FakePostInlineAdditionalPropertiesPayloadArrayData
+        endpoint = self.api.post_inline_additional_properties_ref_payload
         assert endpoint.openapi_types['inline_additional_properties_ref_payload'] == (InlineAdditionalPropertiesRefPayload,)
         assert endpoint.settings['response_type'] == (InlineAdditionalPropertiesRefPayload,)
 
@@ -617,7 +649,7 @@ class TestFakeApi(unittest.TestCase):
         from petstore_api.rest import RESTClientObject, RESTResponse
         with patch.object(RESTClientObject, 'request') as mock_method:
             expected_json_body = {
-                'array_data': [
+                'arrayData': [
                     {
                         'labels': [
                             None,
@@ -628,23 +660,27 @@ class TestFakeApi(unittest.TestCase):
             }
             inline_additional_properties_ref_payload = InlineAdditionalPropertiesRefPayload(
                 array_data=[
-                    FakeGetInlineAdditionalPropertiesPayloadArrayData(labels=[None, 'foo'])
+                    FakePostInlineAdditionalPropertiesPayloadArrayData(labels=[None, 'foo'])
                 ]
             )
             mock_method.return_value = self.mock_response(expected_json_body)
 
             response = endpoint(inline_additional_properties_ref_payload=inline_additional_properties_ref_payload)
-            self.assert_request_called_with(mock_method, 'http://petstore.swagger.io:80/v2/fake/refs/enum', body=expected_json_body)
+            self.assert_request_called_with(
+                mock_method,
+                'http://petstore.swagger.io:80/v2/fake/postInlineAdditionalPropertiesRefPayload',
+                body=expected_json_body
+            )
 
             assert isinstance(response, InlineAdditionalPropertiesRefPayload)
-            assert response.to_dict() == expected_json_body
+            assert model_to_dict(response) == expected_json_body
 
-    def test_get_inline_additional_properties_payload(self):
-        """Test case for getInlineAdditionlPropertiesPayload
+    def test_post_inline_additional_properties_payload(self):
+        """Test case for postInlineAdditionlPropertiesPayload
         """
         from petstore_api.model.inline_object6 import InlineObject6
-        from petstore_api.model.fake_get_inline_additional_properties_payload_array_data import FakeGetInlineAdditionalPropertiesPayloadArrayData
-        endpoint = self.api.get_inline_additional_properties_payload
+        from petstore_api.model.fake_post_inline_additional_properties_payload_array_data import FakePostInlineAdditionalPropertiesPayloadArrayData
+        endpoint = self.api.post_inline_additional_properties_payload
         assert endpoint.openapi_types['inline_object6'] == (InlineObject6,)
         assert endpoint.settings['response_type'] == (InlineObject6,)
 
@@ -652,7 +688,7 @@ class TestFakeApi(unittest.TestCase):
         from petstore_api.rest import RESTClientObject, RESTResponse
         with patch.object(RESTClientObject, 'request') as mock_method:
             expected_json_body = {
-                'array_data': [
+                'arrayData': [
                     {
                         'labels': [
                             None,
@@ -663,16 +699,20 @@ class TestFakeApi(unittest.TestCase):
             }
             inline_object6 = InlineObject6(
                 array_data=[
-                    FakeGetInlineAdditionalPropertiesPayloadArrayData(labels=[None, 'foo'])
+                    FakePostInlineAdditionalPropertiesPayloadArrayData(labels=[None, 'foo'])
                 ]
             )
             mock_method.return_value = self.mock_response(expected_json_body)
 
             response = endpoint(inline_object6=inline_object6)
-            self.assert_request_called_with(mock_method, 'http://petstore.swagger.io:80/v2/fake/refs/enum', body=expected_json_body)
+            self.assert_request_called_with(
+                mock_method,
+                'http://petstore.swagger.io:80/v2/fake/postInlineAdditionalPropertiesPayload',
+                body=expected_json_body
+            )
 
             assert isinstance(response, InlineObject6)
-            assert response.to_dict() == expected_json_body
+            assert model_to_dict(response) == expected_json_body
 
 if __name__ == '__main__':
     unittest.main()