Callbacks service docs updated

interface/models/common/describable.yaml

@@ -1,13 +1,16 @@
 components:
   schemas:
     Describable:
+      description: Common naming metadata for user-defined entities.
       type: object
       additionalProperties: false
       required:
         - name
       properties:
         name:
+          description: Human-readable name of the entity.
           type: string
         description:
+          description: Optional free-form description of the entity.
           type: string
           nullable: true

interface/models/common/money.yaml

@@ -1,6 +1,7 @@
 components:
   schemas:
     Money:
+      description: Monetary value represented by a decimal amount and ISO currency code.
       type: object
       additionalProperties: false
       required:
@@ -12,5 +13,6 @@ components:
           description: Decimal string amount.
           example: '125.50'
         currency:
+          description: ISO 4217 currency code for the provided amount.
           type: string
           example: USD

interface/models/common/pagination.yaml

@@ -1,8 +1,10 @@
 components:
   schemas:
     CursorPageResponse:
+      description: Cursor-based pagination metadata returned with list responses.
       type: object
       additionalProperties: false
       properties:
         next_cursor:
+          description: Opaque cursor to request the next page; omitted when no more items exist.
           type: string