Defined the GET /oauth/identity endpoints on the OpenAPI specification document in the library target.

Sources/DiscogsService/openapi.yaml

@@ -333,6 +333,34 @@ paths:
               $ref: '#/components/headers/OAuthSecret'
         '500':
           $ref: '#/components/responses/InternalError'
+  /oauth/identity:
+    get:
+      tags:
+        - Authentication
+      summary: Get information about an authenticated user.
+      description: |
+        Retrieve basic information about the authenticated user.
+
+        This endpoint represents the (optional) [5th step of the OAuth flow process](https://www.discogs.com/developers#header-5-send-authenticated-requests-to-discogs-endpoints), as it is advised to perform a sanity check to ensure the *OAuth* process finished successfully.
+
+        For further details about this process, please refer to the [OAuth flow](https://www.discogs.com/developers#page:authentication,header:authentication-oauth-flow) section in the [Discogs API authentication](https://www.discogs.com/developers#page:authentication) documentation.
+      operationId: getUserIdentity
+      responses:
+        '200':
+          description: Successfully retrieved information about an authenticated user.
+          headers:
+            X-Discogs-RateLimit:
+              $ref: '#/components/headers/RateLimit'
+            X-Discogs-RateLimit-Used:
+              $ref: '#/components/headers/RateLimitUsed'
+            X-Discogs-RateLimit-Remaining:
+              $ref: '#/components/headers/RateLimitRemaining'
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/UserIdentity'
+        '401':
+          $ref: '#/components/responses/Unauthorized'
   /artists/{artist_id}:
     get:
       tags:
@@ -2044,6 +2072,15 @@ components:
         - id
         - resource_url
         - username
+    UserIdentity:
+      description: A type that represents a user identity.
+      allOf:
+        - $ref: '#/components/schemas/UserId'
+        - type: object
+          properties:
+            consumer_name:
+              description: A name of an application a user utilizes to interacts with the service.
+              type: string
     Video:
       description: A type that represents a video.
       type: object