Implemented the GET /marketplace/stats/{release_id} endpoint for the Open API specification document in the library target.

Sources/DiscogsService/openapi.yaml

@@ -2312,6 +2312,42 @@ paths:
           $ref: '#/components/responses/NotFound'
         '500':
           $ref: '#/components/responses/InternalError'
+  /marketplace/stats/{release_id}:
+    get:
+      tags:
+        - Marketplace
+      summary: Get some statistics of a release.
+      description: |
+        Retrieves some statistics for a release in a marketplace. 
+        
+        These statistics reflect the currentt state of a release in a marketplace, and include the number of items currently for sale, lowest listed price of any item for sale, and whether the item is blocked for sale in a marketplace.
+
+        This endpoints mandates that authentication is optional. In case of authentication, the lowest currency expressed in their own buyer currency, configurable in buyer settings by default, in the absence of the `curr_abbr` parameter in the query. Otherwise, the price expressed in US dollars, if no currency is provided.
+
+        Releases that have no items for sale in a marketplace returns no data in the `lowest_price` and `num_for_sale` keys. Releases that are blocked for sale will also have no data for these keys.
+      operationId: getStatistics
+      parameters:
+        - $ref: '#/components/parameters/ReleaseId'
+        - $ref: '#/components/parameters/Currency'
+      responses:
+        '200':
+          description: Successfully retrieved statistics for a given release.
+          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:
+                description: A group of statistics for a release.
+                $ref: '#/components/schemas/ReleaseStatistics'
+        '404':
+          $ref: '#/components/responses/NotFound'
+        '500':
+          $ref: '#/components/responses/InternalError'
 components:
   headers:
     Link:
@@ -4367,6 +4403,22 @@ components:
       required:
         - num_have
         - num_want
+    ReleaseStatistics:
+      description: A type that represents the statistics of a release.
+      type: object
+      properties:
+        blocked_from_sale:
+          description: A flag that indicates whether a release is blocked from sale in a marketplace or not.
+          type: boolean
+        num_for_sale:
+          description: A number of items for sale in a marketplace.
+          type: integer
+          minimum: 0
+        lowest_price:
+          description: A number for a lowest price of a release in a marketplace.
+          $ref: '#/components/schemas/Price'
+      required:
+        - blocked_from_sale
     ReleaseVersion:
       description: A type that represents a version of a release.
       type: object