added api docs

interface/models/common/describable.yaml

@@ -0,0 +1,13 @@
+components:
+  schemas:
+    Describable:
+      type: object
+      additionalProperties: false
+      required:
+        - name
+      properties:
+        name:
+          type: string
+        description:
+          type: string
+          nullable: true

interface/models/common/money.yaml

@@ -0,0 +1,16 @@
+components:
+  schemas:
+    Money:
+      type: object
+      additionalProperties: false
+      required:
+        - amount
+        - currency
+      properties:
+        amount:
+          type: string
+          description: Decimal string amount.
+          example: '125.50'
+        currency:
+          type: string
+          example: USD

interface/models/common/pagination.yaml

@@ -0,0 +1,8 @@
+components:
+  schemas:
+    CursorPageResponse:
+      type: object
+      additionalProperties: false
+      properties:
+        next_cursor:
+          type: string