openapi: 3.0.0
info:
  title: api-test
  version: '1.0'
servers:
  - url: 'http://localhost:3000'
paths:
  /users:
    post:
      parameters:
        - in: query
          name: page
          schema:
            type: integer
      requestBody:
        content:
          application/json:
            schema:    
              type: object
              required:
                - registered_at
              properties:
                age:
                  type: integer
                registered_at:
                  type: string
                  format: "date-time"
      responses:
        '204':
          description: No Content
          content:
            application/json:
              schema:
                type: object