diff --git a/modules/integration/tests-common/clients/publisher/api/openapi.yaml b/modules/integration/tests-common/clients/publisher/api/openapi.yaml
index b4ce30723f..9ca4fd290c 100644
--- a/modules/integration/tests-common/clients/publisher/api/openapi.yaml
+++ b/modules/integration/tests-common/clients/publisher/api/openapi.yaml
@@ -10187,7 +10187,10 @@ paths:
         style: simple
       responses:
         "200":
-          content: {}
+          content:
+            application/json:
+              schema:
+                type: string
           description: |
             OK.
             Requested swagger document of the API is returned
diff --git a/modules/integration/tests-common/clients/publisher/docs/ApiProductsApi.md b/modules/integration/tests-common/clients/publisher/docs/ApiProductsApi.md
index 5ad8c3153c..869926f3c5 100644
--- a/modules/integration/tests-common/clients/publisher/docs/ApiProductsApi.md
+++ b/modules/integration/tests-common/clients/publisher/docs/ApiProductsApi.md
@@ -231,7 +231,7 @@ Name | Type | Description  | Notes
 
 <a name="getAPIProductSwagger"></a>
 # **getAPIProductSwagger**
-> getAPIProductSwagger(apiProductId, accept, ifNoneMatch)
+> String getAPIProductSwagger(apiProductId, accept, ifNoneMatch)
 
 Get Swagger Definition
 
@@ -261,7 +261,8 @@ public class Example {
     String accept = "\"application/json\""; // String | Media types acceptable for the response. Default is application/json. 
     String ifNoneMatch = "ifNoneMatch_example"; // String | Validator for conditional requests; based on the ETag of the formerly retrieved variant of the resource. 
     try {
-      apiInstance.getAPIProductSwagger(apiProductId, accept, ifNoneMatch);
+      String result = apiInstance.getAPIProductSwagger(apiProductId, accept, ifNoneMatch);
+      System.out.println(result);
     } catch (ApiException e) {
       System.err.println("Exception when calling ApiProductsApi#getAPIProductSwagger");
       System.err.println("Status code: " + e.getCode());
@@ -283,7 +284,7 @@ Name | Type | Description  | Notes
 
 ### Return type
 
-null (empty response body)
+**String**
 
 ### Authorization
 
diff --git a/modules/integration/tests-common/clients/publisher/src/gen/java/org/wso2/am/integration/clients/publisher/api/v1/ApiProductsApi.java b/modules/integration/tests-common/clients/publisher/src/gen/java/org/wso2/am/integration/clients/publisher/api/v1/ApiProductsApi.java
index 58c6592172..ebf588dbb9 100644
--- a/modules/integration/tests-common/clients/publisher/src/gen/java/org/wso2/am/integration/clients/publisher/api/v1/ApiProductsApi.java
+++ b/modules/integration/tests-common/clients/publisher/src/gen/java/org/wso2/am/integration/clients/publisher/api/v1/ApiProductsApi.java
@@ -518,6 +518,7 @@ private okhttp3.Call getAPIProductSwaggerValidateBeforeCall(String apiProductId,
      * @param apiProductId **API Product ID** consisting of the **UUID** of the API Product. Using the **UUID** in the API call is recommended.  (required)
      * @param accept Media types acceptable for the response. Default is application/json.  (optional, default to &quot;application/json&quot;)
      * @param ifNoneMatch Validator for conditional requests; based on the ETag of the formerly retrieved variant of the resource.  (optional)
+     * @return String
      * @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body
      * @http.response.details
      <table summary="Response Details" border="1">
@@ -528,8 +529,9 @@ private okhttp3.Call getAPIProductSwaggerValidateBeforeCall(String apiProductId,
         <tr><td> 406 </td><td> Not Acceptable. The requested media type is not supported. </td><td>  -  </td></tr>
      </table>
      */
-    public void getAPIProductSwagger(String apiProductId, String accept, String ifNoneMatch) throws ApiException {
-        getAPIProductSwaggerWithHttpInfo(apiProductId, accept, ifNoneMatch);
+    public String getAPIProductSwagger(String apiProductId, String accept, String ifNoneMatch) throws ApiException {
+        ApiResponse<String> localVarResp = getAPIProductSwaggerWithHttpInfo(apiProductId, accept, ifNoneMatch);
+        return localVarResp.getData();
     }
 
     /**
@@ -538,7 +540,7 @@ public void getAPIProductSwagger(String apiProductId, String accept, String ifNo
      * @param apiProductId **API Product ID** consisting of the **UUID** of the API Product. Using the **UUID** in the API call is recommended.  (required)
      * @param accept Media types acceptable for the response. Default is application/json.  (optional, default to &quot;application/json&quot;)
      * @param ifNoneMatch Validator for conditional requests; based on the ETag of the formerly retrieved variant of the resource.  (optional)
-     * @return ApiResponse&lt;Void&gt;
+     * @return ApiResponse&lt;String&gt;
      * @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body
      * @http.response.details
      <table summary="Response Details" border="1">
@@ -549,9 +551,10 @@ public void getAPIProductSwagger(String apiProductId, String accept, String ifNo
         <tr><td> 406 </td><td> Not Acceptable. The requested media type is not supported. </td><td>  -  </td></tr>
      </table>
      */
-    public ApiResponse<Void> getAPIProductSwaggerWithHttpInfo(String apiProductId, String accept, String ifNoneMatch) throws ApiException {
+    public ApiResponse<String> getAPIProductSwaggerWithHttpInfo(String apiProductId, String accept, String ifNoneMatch) throws ApiException {
         okhttp3.Call localVarCall = getAPIProductSwaggerValidateBeforeCall(apiProductId, accept, ifNoneMatch, null);
-        return localVarApiClient.execute(localVarCall);
+        Type localVarReturnType = new TypeToken<String>(){}.getType();
+        return localVarApiClient.execute(localVarCall, localVarReturnType);
     }
 
     /**
@@ -572,10 +575,11 @@ public ApiResponse<Void> getAPIProductSwaggerWithHttpInfo(String apiProductId, S
         <tr><td> 406 </td><td> Not Acceptable. The requested media type is not supported. </td><td>  -  </td></tr>
      </table>
      */
-    public okhttp3.Call getAPIProductSwaggerAsync(String apiProductId, String accept, String ifNoneMatch, final ApiCallback<Void> _callback) throws ApiException {
+    public okhttp3.Call getAPIProductSwaggerAsync(String apiProductId, String accept, String ifNoneMatch, final ApiCallback<String> _callback) throws ApiException {
 
         okhttp3.Call localVarCall = getAPIProductSwaggerValidateBeforeCall(apiProductId, accept, ifNoneMatch, _callback);
-        localVarApiClient.executeAsync(localVarCall, _callback);
+        Type localVarReturnType = new TypeToken<String>(){}.getType();
+        localVarApiClient.executeAsync(localVarCall, localVarReturnType, _callback);
         return localVarCall;
     }
     /**
diff --git a/modules/integration/tests-common/clients/publisher/src/main/resources/publisher-api.yaml b/modules/integration/tests-common/clients/publisher/src/main/resources/publisher-api.yaml
index de67456fcb..4782209fc1 100644
--- a/modules/integration/tests-common/clients/publisher/src/main/resources/publisher-api.yaml
+++ b/modules/integration/tests-common/clients/publisher/src/main/resources/publisher-api.yaml
@@ -5693,7 +5693,11 @@ paths:
                 The content type of the body.
               schema:
                 type: string
-          content: {}
+          content:
+            application/json:
+              schema:
+                type: string
+                example: ""
         304:
           description: |
             Not Modified.
diff --git a/modules/integration/tests-common/integration-test-utils/src/main/java/org/wso2/am/integration/test/impl/RestAPIPublisherImpl.java b/modules/integration/tests-common/integration-test-utils/src/main/java/org/wso2/am/integration/test/impl/RestAPIPublisherImpl.java
index f1c676f2bc..94a8aaa301 100644
--- a/modules/integration/tests-common/integration-test-utils/src/main/java/org/wso2/am/integration/test/impl/RestAPIPublisherImpl.java
+++ b/modules/integration/tests-common/integration-test-utils/src/main/java/org/wso2/am/integration/test/impl/RestAPIPublisherImpl.java
@@ -1124,6 +1124,13 @@ public String getSwaggerByID(String apiId) throws ApiException {
         return response.getData();
     }
 
+    public String getAPIProductSwaggerByID(String apiProductId) throws ApiException {
+
+        ApiResponse<String> response = apiProductsApi.getAPIProductSwaggerWithHttpInfo(apiProductId, null, null);
+        Assert.assertEquals(HttpStatus.SC_OK, response.getStatusCode());
+        return response.getData();
+    }
+
     public String updateSwagger(String apiId, String definition) throws ApiException {
 
         ApiResponse<String> apiResponse = apIsApi.updateAPISwaggerWithHttpInfo(apiId, null, definition, null, null);
diff --git a/modules/integration/tests-integration/tests-backend/src/test/java/org/wso2/am/integration/tests/apiproduct/APIProductCreationTestCase.java b/modules/integration/tests-integration/tests-backend/src/test/java/org/wso2/am/integration/tests/apiproduct/APIProductCreationTestCase.java
index bf294f02b5..7f6cb9e9cb 100644
--- a/modules/integration/tests-integration/tests-backend/src/test/java/org/wso2/am/integration/tests/apiproduct/APIProductCreationTestCase.java
+++ b/modules/integration/tests-integration/tests-backend/src/test/java/org/wso2/am/integration/tests/apiproduct/APIProductCreationTestCase.java
@@ -35,6 +35,7 @@
 import org.wso2.am.integration.clients.publisher.api.v1.dto.APIOperationPoliciesDTO;
 import org.wso2.am.integration.clients.publisher.api.v1.dto.APIProductDTO;
 import org.wso2.am.integration.clients.publisher.api.v1.dto.LifecycleStateDTO;
+import org.wso2.am.integration.clients.publisher.api.v1.dto.OpenAPIDefinitionValidationResponseDTO;
 import org.wso2.am.integration.clients.publisher.api.v1.dto.OperationPolicyDTO;
 import org.wso2.am.integration.clients.publisher.api.v1.dto.WorkflowResponseDTO;
 import org.wso2.am.integration.clients.publisher.api.v1.dto.APIOperationsDTO;
@@ -49,10 +50,13 @@
 import org.wso2.am.integration.test.utils.bean.APILifeCycleState;
 import org.wso2.am.integration.tests.api.lifecycle.APIManagerLifecycleBaseTest;
 import org.wso2.carbon.automation.engine.context.TestUserMode;
+import org.wso2.carbon.automation.test.utils.common.TestConfigurationProvider;
 import org.wso2.carbon.automation.test.utils.http.client.HttpResponse;
 import org.wso2.carbon.integration.common.admin.client.UserManagementClient;
 
+import java.io.BufferedWriter;
 import java.io.File;
+import java.io.FileWriter;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
@@ -65,6 +69,7 @@
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
 
 public class APIProductCreationTestCase extends APIManagerLifecycleBaseTest {
 
@@ -76,6 +81,7 @@ public class APIProductCreationTestCase extends APIManagerLifecycleBaseTest {
     private static final String SCOPE = "restricted_scope";
     private ApiTestHelper apiTestHelper;
     private ApiProductTestHelper apiProductTestHelper;
+    private String resourcePath;
 
     @Factory(dataProvider = "userModeDataProvider")
     public APIProductCreationTestCase(TestUserMode userMode) {
@@ -96,6 +102,8 @@ public static Object[][] userModeDataProvider() {
     public void initialize() throws Exception {
 
         super.init(userMode);
+        resourcePath = TestConfigurationProvider.getResourceLocation() + File.separator + "oas" + File.separator + "v3"
+                + File.separator + "api-product" + File.separator;
         userManagementClient = new UserManagementClient(keyManagerContext.getContextUrls().getBackEndUrl(),
                 createSession(keyManagerContext));
         apiTestHelper = new ApiTestHelper(restAPIPublisher, restAPIStore, getAMResourceLocation(),
@@ -605,6 +613,73 @@ public void testCreateAndDeployApiProductWithMutualSSLEnabled() throws Exception
         Assert.assertNotNull(revisionUUID);
     }
 
+    @Test(groups = { "wso2.am" }, description = "API product swagger definition reference verification")
+    public void testAPIProductSwaggerDefinition() throws Exception {
+
+        // Create a REST API using swagger definition
+        List<APIDTO> apisToBeUsed = new ArrayList<>();
+        String swaggerPath = resourcePath + "test-api-1-oas.yaml";
+        File definition = new File(swaggerPath);
+        org.json.JSONObject endpoints = new org.json.JSONObject();
+        endpoints.put("url", "https://test.com");
+
+        org.json.JSONObject endpointConfig = new org.json.JSONObject();
+        endpointConfig.put("endpoint_type", "http");
+        endpointConfig.put("production_endpoints", endpoints);
+        endpointConfig.put("sandbox_endpoints", endpoints);
+
+        List<String> tierList = new ArrayList<>();
+        tierList.add(APIMIntegrationConstants.API_TIER.SILVER);
+        tierList.add(APIMIntegrationConstants.API_TIER.GOLD);
+
+        org.json.JSONObject apiProperties = new org.json.JSONObject();
+        apiProperties.put("name", "testAPI1");
+        apiProperties.put("context", "/testapi1");
+        apiProperties.put("version", "1.0.0");
+        apiProperties.put("provider", user.getUserName());
+        apiProperties.put("endpointConfig", endpointConfig);
+        apiProperties.put("policies", tierList);
+
+        APIDTO apiOne = restAPIPublisher.importOASDefinition(definition, apiProperties.toString());
+        APIDTO apiTwo = apiTestHelper.createApiTwo(getBackendEndServiceEndPointHttp("wildcard/resources"));
+        apisToBeUsed.add(apiOne);
+        apisToBeUsed.add(apiTwo);
+
+        // Create API Product and verify in publisher
+        final String provider = user.getUserName();
+        final String name = UUID.randomUUID().toString();
+        final String context = "/" + UUID.randomUUID().toString();
+
+        List<String> policies = Arrays.asList(TIER_UNLIMITED, TIER_GOLD);
+
+        APIProductDTO apiProductDTO = apiProductTestHelper.createAPIProductInPublisher(
+                provider, name, context, apisToBeUsed, policies);
+        createAPIProductRevisionAndDeployUsingRest(apiProductDTO.getId(), restAPIPublisher);
+        waitForAPIDeployment();
+        apiProductTestHelper.verfiyApiProductInPublisher(apiProductDTO);
+        apiProductDTO = publishAPIProduct(apiProductDTO.getId());
+        String apiProductID = apiProductDTO.getId();
+
+        // Get api product definition and validate
+        String apiProductDefinition = restAPIPublisher.getAPIProductSwaggerByID(apiProductID);
+        validateDefinition(apiProductDefinition);
+    }
+
+    private void validateDefinition(String oasDefinition) throws Exception {
+        File file = geTempFileWithContent(oasDefinition);
+        OpenAPIDefinitionValidationResponseDTO responseDTO = restAPIPublisher.validateOASDefinition(file);
+        assertTrue(responseDTO.isIsValid());
+    }
+
+    private File geTempFileWithContent(String swagger) throws Exception {
+        File temp = File.createTempFile("swagger", ".json");
+        temp.deleteOnExit();
+        BufferedWriter out = new BufferedWriter(new FileWriter(temp));
+        out.write(swagger);
+        out.close();
+        return temp;
+    }
+    
     @AfterClass(alwaysRun = true)
     public void cleanUpArtifacts() throws Exception {
 
diff --git a/modules/integration/tests-integration/tests-backend/src/test/resources/oas/v3/api-product/test-api-1-oas.yaml b/modules/integration/tests-integration/tests-backend/src/test/resources/oas/v3/api-product/test-api-1-oas.yaml
new file mode 100644
index 0000000000..0ad7037e8e
--- /dev/null
+++ b/modules/integration/tests-integration/tests-backend/src/test/resources/oas/v3/api-product/test-api-1-oas.yaml
@@ -0,0 +1,139 @@
+openapi: 3.0.1
+info:
+  title: testAPI1
+  version: 1.0.0
+servers:
+  - url: /
+security:
+  - default: []
+paths:
+  "/users/{userID}/products/":
+    get:
+      parameters:
+        - name: userID
+          in: path
+          required: true
+          style: simple
+          explode: false
+          schema:
+            type: string
+            format: string
+      responses:
+        "200":
+          description: ok
+      security:
+        - default: []
+      x-auth-type: Application & Application User
+      x-throttling-tier: Unlimited
+      x-wso2-application-security:
+        security-types:
+          - oauth2
+        optional: false
+  "/users/{userID}/products/{productID}":
+    get:
+      parameters:
+        - $ref: "#/components/parameters/userIDPathParam"
+      responses:
+        "200":
+          description: ok
+      security:
+        - default: []
+      x-auth-type: Application & Application User
+      x-throttling-tier: Unlimited
+      x-wso2-application-security:
+        security-types:
+          - oauth2
+        optional: false
+    post:
+      parameters:
+        - $ref: "#/components/parameters/userIDPathParam"
+      responses:
+        "200":
+          description: ok
+          headers:
+            location:
+              $ref: "#/components/headers/Location"
+      security:
+        - default: []
+      x-auth-type: Application & Application User
+      x-throttling-tier: Unlimited
+      x-wso2-application-security:
+        security-types:
+          - oauth2
+        optional: false
+    parameters:
+      - $ref: "#/components/parameters/ProductIDPathParam"
+components:
+  parameters:
+    ProductIDPathParam:
+      name: productID
+      in: path
+      required: true
+      style: simple
+      explode: false
+      schema:
+        type: string
+        format: string
+    userIDPathParam:
+      name: userID
+      in: path
+      required: true
+      style: simple
+      explode: false
+      schema:
+        type: string
+        format: string
+  headers:
+    Location:
+      description: Location of the new created resource
+      style: simple
+      explode: false
+      schema:
+        type: string
+        format: uri
+  securitySchemes:
+    default:
+      type: oauth2
+      flows:
+        implicit:
+          authorizationUrl: "https://test.com"
+          scopes: {}
+x-wso2-auth-header: Authorization
+x-wso2-cors:
+  corsConfigurationEnabled: false
+  accessControlAllowOrigins:
+    - "*"
+  accessControlAllowCredentials: false
+  accessControlAllowHeaders:
+    - authorization
+    - Access-Control-Allow-Origin
+    - Content-Type
+    - SOAPAction
+    - apikey
+    - Internal-Key
+  accessControlAllowMethods:
+    - GET
+    - PUT
+    - POST
+    - DELETE
+    - PATCH
+    - OPTIONS
+x-wso2-production-endpoints:
+  urls:
+    - "http://api.yourdomain.com/"
+  type: http
+x-wso2-sandbox-endpoints:
+  urls:
+    - "http://api.yourdomain.com/"
+  type: http
+x-wso2-basePath: /testapi1/1.0.0
+x-wso2-transports:
+  - http
+  - https
+x-wso2-application-security:
+  security-types:
+    - oauth2
+  optional: false
+x-wso2-response-cache:
+  enabled: false
+  cacheTimeoutInSeconds: 300