Implemented the POST /users/{username}/collection/folders/{folder_id}/releases/{release_id}/instances/{instance_id} endpoint for the Open API specification document in the library target.

Sources/DiscogsService/openapi.yaml

@@ -1377,6 +1377,44 @@ paths:
           $ref: '#/components/responses/NotFound'
         '500':
           $ref: '#/components/responses/InternalError'
+  /users/{username}/collection/folders/{folder_id}/releases/{release_id}/instances/{instance_id}:
+    post:
+      tags:
+        - User Collection
+      summary: Update a rating for a specified release instance in a specified collection folder of a user.
+      description: |
+        Changes the rating on a release and/or move the instance to another folder.
+
+        This endpoint potentially takes 2 `folder_id` parameters: 1) in the URL (which is the folder you are requesting, and is required), and 2) in the request body (representing the folder you want to move the instance to, which is optional)
+
+        This endpoints requires authentication as the collection owner.
+      operationId: postChangeRatingOfRelease
+      parameters:
+        - $ref: '#/components/parameters/Username'
+        - $ref: '#/components/parameters/FolderId'
+        - $ref: '#/components/parameters/ReleaseId'
+        - $ref: '#/components/parameters/InstanceId'
+        - $ref: '#/components/parameters/Rating'
+      security:
+        - ConsumerKeySecret: []
+        - UserToken: []
+        - OAuth: []
+      responses:
+        '204':
+          description: Successfully updated a rating for a specific release instance inside a collection folder of a 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'
+        '403':
+          $ref: '#/components/responses/NotAccessable'
+        '404':
+          $ref: '#/components/responses/NotFound'
+        '500':
+          $ref: '#/components/responses/InternalError'
 components:
   headers:
     Link:
@@ -1499,6 +1537,15 @@ components:
         type: string
         format: uri
       example: https://www.some-home.page
+    InstanceId:
+      description: An identifier of a release instance.
+      name: instance_id
+      in: path
+      required: true
+      schema:
+        type: integer
+        minimum: 0
+      example: 3
     Label:
       description: A filter by label.
       name: label
@@ -1575,7 +1622,6 @@ components:
       description: A number (between 1 and 5) for a rating of a release.
       name: rating
       in: query
-      required: true
       schema:
         type: integer
         minimum: 1