diff --git a/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/apiclient-header.mustache b/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/apiclient-header.mustache
index 33addd7a397f..73eee1dc322d 100644
--- a/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/apiclient-header.mustache
+++ b/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/apiclient-header.mustache
@@ -13,7 +13,9 @@
 #include "{{packageName}}/ApiException.h"
 #include "{{packageName}}/IHttpBody.h"
 #include "{{packageName}}/HttpContent.h"
-
+{{^hasModelImport}}
+#include "{{packageName}}/ModelBase.h"
+{{/hasModelImport}}
 #if  defined (_WIN32) || defined (_WIN64)
 #undef U
 #endif
@@ -52,6 +54,9 @@ public:
     static utility::string_t parameterToString(double value);
     static utility::string_t parameterToString(const utility::datetime &value);
     static utility::string_t parameterToString(bool value);
+    {{^hasModelImport}}
+    static utility::string_t parameterToString(const ModelBase& value);
+    {{/hasModelImport}}
     template<class T>
     static utility::string_t parameterToString(const std::vector<T>& value);
     template<class T>
diff --git a/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/apiclient-source.mustache b/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/apiclient-source.mustache
index 08407320b086..c69b3886876e 100644
--- a/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/apiclient-source.mustache
+++ b/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/apiclient-source.mustache
@@ -79,6 +79,13 @@ utility::string_t ApiClient::parameterToString(const utility::datetime &value)
     return utility::conversions::to_string_t(value.to_string(utility::datetime::ISO_8601));
 }
 
+{{^hasModelImport}}
+utility::string_t ApiClient::parameterToString(const ModelBase& value)
+{
+    return value.toJson().serialize();
+}
+{{/hasModelImport}}
+
 utility::string_t ApiClient::parameterToString(bool value)
 {
     std::stringstream valueAsStringStream;
diff --git a/modules/openapi-generator/src/test/resources/3_0/cpp-restsdk/petstore.yaml b/modules/openapi-generator/src/test/resources/3_0/cpp-restsdk/petstore.yaml
index 5e29ad21a09a..5394e75e5cee 100644
--- a/modules/openapi-generator/src/test/resources/3_0/cpp-restsdk/petstore.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/cpp-restsdk/petstore.yaml
@@ -18,6 +18,30 @@ tags:
   - name: user
     description: Operations about user
 paths:
+  /pets:
+    post:
+      tags:
+        - pet
+      summary: List all pets
+      description: Returns a list of pets
+      parameters:
+        - name: page
+          in: query
+          description: The page number
+          required: false
+          schema:
+            $ref: '#/components/schemas/Page'
+      responses:
+        '200':
+          description: A list of pets
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/Pet'
+        '400':
+          description: Invalid page number
   /pet:
     post:
       tags:
@@ -832,3 +856,13 @@ components:
                   boosterRequired:
                     type: boolean
                     description: true if a booster is still needed to complete the vaccination
+    Page:
+      type: object
+      properties:
+        page:
+          type: integer
+          format: int32
+        perPage:
+          type: integer
+          format: int32
+        
diff --git a/samples/client/petstore/cpp-restsdk/client/.openapi-generator/FILES b/samples/client/petstore/cpp-restsdk/client/.openapi-generator/FILES
index 3c4a10c10335..2408edf0ae03 100644
--- a/samples/client/petstore/cpp-restsdk/client/.openapi-generator/FILES
+++ b/samples/client/petstore/cpp-restsdk/client/.openapi-generator/FILES
@@ -22,6 +22,7 @@ include/CppRestPetstoreClient/model/Category.h
 include/CppRestPetstoreClient/model/Color.h
 include/CppRestPetstoreClient/model/CreateUserOrPet_request.h
 include/CppRestPetstoreClient/model/Order.h
+include/CppRestPetstoreClient/model/Page.h
 include/CppRestPetstoreClient/model/Pet.h
 include/CppRestPetstoreClient/model/SchemaWithSet.h
 include/CppRestPetstoreClient/model/SchemaWithSet_vaccinationBook.h
@@ -46,6 +47,7 @@ src/model/Category.cpp
 src/model/Color.cpp
 src/model/CreateUserOrPet_request.cpp
 src/model/Order.cpp
+src/model/Page.cpp
 src/model/Pet.cpp
 src/model/SchemaWithSet.cpp
 src/model/SchemaWithSet_vaccinationBook.cpp
diff --git a/samples/client/petstore/cpp-restsdk/client/include/CppRestPetstoreClient/ApiClient.h b/samples/client/petstore/cpp-restsdk/client/include/CppRestPetstoreClient/ApiClient.h
index b4d26fb69560..9b3fa59fa062 100644
--- a/samples/client/petstore/cpp-restsdk/client/include/CppRestPetstoreClient/ApiClient.h
+++ b/samples/client/petstore/cpp-restsdk/client/include/CppRestPetstoreClient/ApiClient.h
@@ -23,7 +23,7 @@
 #include "CppRestPetstoreClient/ApiException.h"
 #include "CppRestPetstoreClient/IHttpBody.h"
 #include "CppRestPetstoreClient/HttpContent.h"
-
+#include "CppRestPetstoreClient/ModelBase.h"
 #if  defined (_WIN32) || defined (_WIN64)
 #undef U
 #endif
@@ -63,6 +63,7 @@ class  ApiClient
     static utility::string_t parameterToString(double value);
     static utility::string_t parameterToString(const utility::datetime &value);
     static utility::string_t parameterToString(bool value);
+    static utility::string_t parameterToString(const ModelBase& value);
     template<class T>
     static utility::string_t parameterToString(const std::vector<T>& value);
     template<class T>
diff --git a/samples/client/petstore/cpp-restsdk/client/include/CppRestPetstoreClient/api/PetApi.h b/samples/client/petstore/cpp-restsdk/client/include/CppRestPetstoreClient/api/PetApi.h
index 33688ff50e23..9a27c1bc1b2a 100644
--- a/samples/client/petstore/cpp-restsdk/client/include/CppRestPetstoreClient/api/PetApi.h
+++ b/samples/client/petstore/cpp-restsdk/client/include/CppRestPetstoreClient/api/PetApi.h
@@ -25,6 +25,7 @@
 #include "CppRestPetstoreClient/model/ApiResponse.h"
 #include "CppRestPetstoreClient/model/Color.h"
 #include "CppRestPetstoreClient/HttpContent.h"
+#include "CppRestPetstoreClient/model/Page.h"
 #include "CppRestPetstoreClient/model/Pet.h"
 #include <vector>
 #include <cpprest/details/basic_types.h>
@@ -110,6 +111,16 @@ class  PetApi
         int64_t petId
     ) const;
     /// <summary>
+    /// List all pets
+    /// </summary>
+    /// <remarks>
+    /// Returns a list of pets
+    /// </remarks>
+    /// <param name="page">The page number (optional, default to nullptr)</param>
+    pplx::task<std::vector<std::shared_ptr<Pet>>> petsPost(
+        boost::optional<std::shared_ptr<Page>> page
+    ) const;
+    /// <summary>
     /// Update an existing pet
     /// </summary>
     /// <remarks>
diff --git a/samples/client/petstore/cpp-restsdk/client/include/CppRestPetstoreClient/model/Page.h b/samples/client/petstore/cpp-restsdk/client/include/CppRestPetstoreClient/model/Page.h
new file mode 100644
index 000000000000..7aeb0858b8b4
--- /dev/null
+++ b/samples/client/petstore/cpp-restsdk/client/include/CppRestPetstoreClient/model/Page.h
@@ -0,0 +1,81 @@
+/**
+ * OpenAPI Petstore
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * The version of the OpenAPI document: 1.0.0
+ *
+ * NOTE: This class is auto generated by OpenAPI-Generator 7.14.0-SNAPSHOT.
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+/*
+ * Page.h
+ *
+ * 
+ */
+
+#ifndef ORG_OPENAPITOOLS_CLIENT_MODEL_Page_H_
+#define ORG_OPENAPITOOLS_CLIENT_MODEL_Page_H_
+
+
+#include "CppRestPetstoreClient/ModelBase.h"
+
+
+namespace org {
+namespace openapitools {
+namespace client {
+namespace model {
+
+
+
+class  Page
+    : public ModelBase
+{
+public:
+    Page();
+    virtual ~Page();
+
+    /////////////////////////////////////////////
+    /// ModelBase overrides
+
+    void validate() override;
+
+    web::json::value toJson() const override;
+    bool fromJson(const web::json::value& json) override;
+
+    void toMultipart(std::shared_ptr<MultipartFormData> multipart, const utility::string_t& namePrefix) const override;
+    bool fromMultiPart(std::shared_ptr<MultipartFormData> multipart, const utility::string_t& namePrefix) override;
+
+
+    /////////////////////////////////////////////
+    /// Page members
+
+
+    int32_t getPage() const;
+    bool pageIsSet() const;
+    void unsetPage();
+    void setPage(int32_t value);
+
+    int32_t getPerPage() const;
+    bool perPageIsSet() const;
+    void unsetPerPage();
+    void setPerPage(int32_t value);
+
+
+protected:
+    int32_t m_Page;
+    bool m_PageIsSet;
+
+    int32_t m_PerPage;
+    bool m_PerPageIsSet;
+
+};
+
+
+}
+}
+}
+}
+
+#endif /* ORG_OPENAPITOOLS_CLIENT_MODEL_Page_H_ */
diff --git a/samples/client/petstore/cpp-restsdk/client/src/ApiClient.cpp b/samples/client/petstore/cpp-restsdk/client/src/ApiClient.cpp
index 037298ba4c2c..9a0b4f0f8202 100644
--- a/samples/client/petstore/cpp-restsdk/client/src/ApiClient.cpp
+++ b/samples/client/petstore/cpp-restsdk/client/src/ApiClient.cpp
@@ -90,6 +90,11 @@ utility::string_t ApiClient::parameterToString(const utility::datetime &value)
     return utility::conversions::to_string_t(value.to_string(utility::datetime::ISO_8601));
 }
 
+utility::string_t ApiClient::parameterToString(const ModelBase& value)
+{
+    return value.toJson().serialize();
+}
+
 utility::string_t ApiClient::parameterToString(bool value)
 {
     std::stringstream valueAsStringStream;
diff --git a/samples/client/petstore/cpp-restsdk/client/src/api/PetApi.cpp b/samples/client/petstore/cpp-restsdk/client/src/api/PetApi.cpp
index 6245be53d004..b6106d528584 100644
--- a/samples/client/petstore/cpp-restsdk/client/src/api/PetApi.cpp
+++ b/samples/client/petstore/cpp-restsdk/client/src/api/PetApi.cpp
@@ -822,6 +822,136 @@ pplx::task<std::shared_ptr<Pet>> PetApi::getPetById(int64_t petId) const
         return localVarResult;
     });
 }
+pplx::task<std::vector<std::shared_ptr<Pet>>> PetApi::petsPost(boost::optional<std::shared_ptr<Page>> page) const
+{
+
+
+    std::shared_ptr<const ApiConfiguration> localVarApiConfiguration( m_ApiClient->getConfiguration() );
+    utility::string_t localVarPath = utility::conversions::to_string_t("/pets");
+
+    std::map<utility::string_t, utility::string_t> localVarQueryParams;
+    std::map<utility::string_t, utility::string_t> localVarHeaderParams( localVarApiConfiguration->getDefaultHeaders() );
+    std::map<utility::string_t, utility::string_t> localVarFormParams;
+    std::map<utility::string_t, std::shared_ptr<HttpContent>> localVarFileParams;
+
+    std::unordered_set<utility::string_t> localVarResponseHttpContentTypes;
+    localVarResponseHttpContentTypes.insert( utility::conversions::to_string_t("application/json") );
+
+    utility::string_t localVarResponseHttpContentType;
+
+    // use JSON if possible
+    if ( localVarResponseHttpContentTypes.size() == 0 )
+    {
+        localVarResponseHttpContentType = utility::conversions::to_string_t("application/json");
+    }
+    // JSON
+    else if ( localVarResponseHttpContentTypes.find(utility::conversions::to_string_t("application/json")) != localVarResponseHttpContentTypes.end() )
+    {
+        localVarResponseHttpContentType = utility::conversions::to_string_t("application/json");
+    }
+    // multipart formdata
+    else if( localVarResponseHttpContentTypes.find(utility::conversions::to_string_t("multipart/form-data")) != localVarResponseHttpContentTypes.end() )
+    {
+        localVarResponseHttpContentType = utility::conversions::to_string_t("multipart/form-data");
+    }
+    else
+    {
+        throw ApiException(400, utility::conversions::to_string_t("PetApi->petsPost does not produce any supported media type"));
+    }
+
+    localVarHeaderParams[utility::conversions::to_string_t("Accept")] = localVarResponseHttpContentType;
+
+    std::unordered_set<utility::string_t> localVarConsumeHttpContentTypes;
+
+    if (page && *page != nullptr)
+    {
+        localVarQueryParams[utility::conversions::to_string_t("page")] = ApiClient::parameterToString(*page);
+    }
+
+    std::shared_ptr<IHttpBody> localVarHttpBody;
+    utility::string_t localVarRequestHttpContentType;
+
+    // use JSON if possible
+    if ( localVarConsumeHttpContentTypes.size() == 0 || localVarConsumeHttpContentTypes.find(utility::conversions::to_string_t("application/json")) != localVarConsumeHttpContentTypes.end() )
+    {
+        localVarRequestHttpContentType = utility::conversions::to_string_t("application/json");
+    }
+    // multipart formdata
+    else if( localVarConsumeHttpContentTypes.find(utility::conversions::to_string_t("multipart/form-data")) != localVarConsumeHttpContentTypes.end() )
+    {
+        localVarRequestHttpContentType = utility::conversions::to_string_t("multipart/form-data");
+    }
+    else if (localVarConsumeHttpContentTypes.find(utility::conversions::to_string_t("application/x-www-form-urlencoded")) != localVarConsumeHttpContentTypes.end())
+    {
+        localVarRequestHttpContentType = utility::conversions::to_string_t("application/x-www-form-urlencoded");
+    }
+    else
+    {
+        throw ApiException(415, utility::conversions::to_string_t("PetApi->petsPost does not consume any supported media type"));
+    }
+
+
+    return m_ApiClient->callApi(localVarPath, utility::conversions::to_string_t("POST"), localVarQueryParams, localVarHttpBody, localVarHeaderParams, localVarFormParams, localVarFileParams, localVarRequestHttpContentType)
+    .then([=, this](web::http::http_response localVarResponse)
+    {
+        if (m_ApiClient->getResponseHandler())
+        {
+            m_ApiClient->getResponseHandler()(localVarResponse.status_code(), localVarResponse.headers());
+        }
+
+        // 1xx - informational : OK
+        // 2xx - successful       : OK
+        // 3xx - redirection   : OK
+        // 4xx - client error  : not OK
+        // 5xx - client error  : not OK
+        if (localVarResponse.status_code() >= 400)
+        {
+            throw ApiException(localVarResponse.status_code()
+                , utility::conversions::to_string_t("error calling petsPost: ") + localVarResponse.reason_phrase()
+                , std::make_shared<std::stringstream>(localVarResponse.extract_utf8string(true).get()));
+        }
+
+        // check response content type
+        if(localVarResponse.headers().has(utility::conversions::to_string_t("Content-Type")))
+        {
+            utility::string_t localVarContentType = localVarResponse.headers()[utility::conversions::to_string_t("Content-Type")];
+            if( localVarContentType.find(localVarResponseHttpContentType) == std::string::npos )
+            {
+                throw ApiException(500
+                    , utility::conversions::to_string_t("error calling petsPost: unexpected response type: ") + localVarContentType
+                    , std::make_shared<std::stringstream>(localVarResponse.extract_utf8string(true).get()));
+            }
+        }
+
+        return localVarResponse.extract_string();
+    })
+    .then([=, this](utility::string_t localVarResponse)
+    {
+        std::vector<std::shared_ptr<Pet>> localVarResult;
+
+        if(localVarResponseHttpContentType == utility::conversions::to_string_t("application/json"))
+        {
+            web::json::value localVarJson = web::json::value::parse(localVarResponse);
+            for( auto& localVarItem : localVarJson.as_array() )
+            {
+                std::shared_ptr<Pet> localVarItemObj;
+                ModelBase::fromJson(localVarItem, localVarItemObj);
+                localVarResult.push_back(localVarItemObj);
+            }
+        }
+        // else if(localVarResponseHttpContentType == utility::conversions::to_string_t("multipart/form-data"))
+        // {
+        // TODO multipart response parsing
+        // }
+        else
+        {
+            throw ApiException(500
+                , utility::conversions::to_string_t("error calling petsPost: unsupported response type"));
+        }
+
+        return localVarResult;
+    });
+}
 pplx::task<std::shared_ptr<Pet>> PetApi::updatePet(std::shared_ptr<Pet> pet) const
 {
 
diff --git a/samples/client/petstore/cpp-restsdk/client/src/model/Page.cpp b/samples/client/petstore/cpp-restsdk/client/src/model/Page.cpp
new file mode 100644
index 000000000000..71fccb0e12ac
--- /dev/null
+++ b/samples/client/petstore/cpp-restsdk/client/src/model/Page.cpp
@@ -0,0 +1,171 @@
+/**
+ * OpenAPI Petstore
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * The version of the OpenAPI document: 1.0.0
+ *
+ * NOTE: This class is auto generated by OpenAPI-Generator 7.14.0-SNAPSHOT.
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+
+
+#include "CppRestPetstoreClient/model/Page.h"
+
+namespace org {
+namespace openapitools {
+namespace client {
+namespace model {
+
+Page::Page()
+{
+    m_Page = 0;
+    m_PageIsSet = false;
+    m_PerPage = 0;
+    m_PerPageIsSet = false;
+}
+
+Page::~Page()
+{
+}
+
+void Page::validate()
+{
+    // TODO: implement validation
+}
+
+web::json::value Page::toJson() const
+{
+    web::json::value val = web::json::value::object();
+    if(m_PageIsSet)
+    {   
+        
+        val[utility::conversions::to_string_t(_XPLATSTR("page"))] = ModelBase::toJson(m_Page);
+    }
+    if(m_PerPageIsSet)
+    {   
+        
+        val[utility::conversions::to_string_t(_XPLATSTR("perPage"))] = ModelBase::toJson(m_PerPage);
+    }
+
+    return val;
+}
+
+bool Page::fromJson(const web::json::value& val)
+{
+    bool ok = true;
+    if(val.has_field(utility::conversions::to_string_t(_XPLATSTR("page"))))
+    {
+        const web::json::value& fieldValue = val.at(utility::conversions::to_string_t(_XPLATSTR("page")));
+        if(!fieldValue.is_null())
+        {
+            int32_t refVal_setPage;
+            ok &= ModelBase::fromJson(fieldValue, refVal_setPage);
+            setPage(refVal_setPage);
+            
+        }
+    }
+    if(val.has_field(utility::conversions::to_string_t(_XPLATSTR("perPage"))))
+    {
+        const web::json::value& fieldValue = val.at(utility::conversions::to_string_t(_XPLATSTR("perPage")));
+        if(!fieldValue.is_null())
+        {
+            int32_t refVal_setPerPage;
+            ok &= ModelBase::fromJson(fieldValue, refVal_setPerPage);
+            setPerPage(refVal_setPerPage);
+            
+        }
+    }
+    return ok;
+}
+
+void Page::toMultipart(std::shared_ptr<MultipartFormData> multipart, const utility::string_t& prefix) const
+{
+    utility::string_t namePrefix = prefix;
+    if(namePrefix.size() > 0 && namePrefix.substr(namePrefix.size() - 1) != utility::conversions::to_string_t(_XPLATSTR(".")))
+    {
+        namePrefix += utility::conversions::to_string_t(_XPLATSTR("."));
+    }
+    if(m_PageIsSet)
+    {
+        multipart->add(ModelBase::toHttpContent(namePrefix + utility::conversions::to_string_t(_XPLATSTR("page")), m_Page));
+    }
+    if(m_PerPageIsSet)
+    {
+        multipart->add(ModelBase::toHttpContent(namePrefix + utility::conversions::to_string_t(_XPLATSTR("perPage")), m_PerPage));
+    }
+}
+
+bool Page::fromMultiPart(std::shared_ptr<MultipartFormData> multipart, const utility::string_t& prefix)
+{
+    bool ok = true;
+    utility::string_t namePrefix = prefix;
+    if(namePrefix.size() > 0 && namePrefix.substr(namePrefix.size() - 1) != utility::conversions::to_string_t(_XPLATSTR(".")))
+    {
+        namePrefix += utility::conversions::to_string_t(_XPLATSTR("."));
+    }
+
+    if(multipart->hasContent(utility::conversions::to_string_t(_XPLATSTR("page"))))
+    {
+        int32_t refVal_setPage;
+        ok &= ModelBase::fromHttpContent(multipart->getContent(utility::conversions::to_string_t(_XPLATSTR("page"))), refVal_setPage );
+        setPage(refVal_setPage);
+    }
+    if(multipart->hasContent(utility::conversions::to_string_t(_XPLATSTR("perPage"))))
+    {
+        int32_t refVal_setPerPage;
+        ok &= ModelBase::fromHttpContent(multipart->getContent(utility::conversions::to_string_t(_XPLATSTR("perPage"))), refVal_setPerPage );
+        setPerPage(refVal_setPerPage);
+    }
+    return ok;
+}
+
+
+int32_t Page::getPage() const
+{
+    return m_Page;
+}
+
+void Page::setPage(int32_t value)
+{
+    m_Page = value;
+    m_PageIsSet = true;
+}
+
+bool Page::pageIsSet() const
+{
+    return m_PageIsSet;
+}
+
+void Page::unsetPage()
+{
+    m_PageIsSet = false;
+}
+int32_t Page::getPerPage() const
+{
+    return m_PerPage;
+}
+
+void Page::setPerPage(int32_t value)
+{
+    m_PerPage = value;
+    m_PerPageIsSet = true;
+}
+
+bool Page::perPageIsSet() const
+{
+    return m_PerPageIsSet;
+}
+
+void Page::unsetPerPage()
+{
+    m_PerPageIsSet = false;
+}
+
+}
+}
+}
+}
+
+