openapi: 3.0.0
info:
  title: Test
  version: 1.0.0

paths:
  /products:
    get:
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ProductDto'

components:

  schemas:

    ProductDto:
      type: object
      allOf:
      - type: object
        properties:
          id:
            type: string
            format: uuid
          createdAt:
            type: string
            format: datetime
        required:
        - id
      - type: object
        properties:
          otherId:
            type: string
            format: uuid
          createdAt:
            type: string
            format: datetime
        required:
        - otherId