openapi: 3.0.3
info: { title: Payment API, version: 1.0.0 }
servers: [ { url: https://your-domain.com/api/v1 } ]
tags: [ { name: Payments } ]
security: [ { bearerAuth: [] } ]

paths:
  /payments:
    get:
      tags: [Payments]
      summary: List payments
      parameters:
        - in: query
          name: page
          schema: { type: integer, default: 1 }
        - in: query
          name: per_page
          schema: { type: integer, default: 20 }
        - in: query
          name: parent_id
          schema: { type: integer }
        - in: query
          name: status
          schema: { type: string }
      responses:
        "200": { description: Payments retrieved }
    post:
      tags: [Payments]
      summary: Create payment
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required: [parent_id, invoice_id, total_amount, payment_method, payment_date]
              properties:
                parent_id: { type: integer }
                invoice_id: { type: integer }
                total_amount: { type: number }
                paid_amount: { type: number }
                balance: { type: number }
                number_of_installments: { type: integer }
                payment_method: { type: string }
                payment_date: { type: string, format: date }
                check_number: { type: string }
                status: { type: string }
      responses:
        "201": { description: Payment created }

  /payments/{id}:
    get:
      tags: [Payments]
      summary: Get payment by ID
      parameters:
        - in: path
          name: id
          required: true
          schema: { type: integer }
      responses:
        "200": { description: Payment }
        "404": { description: Not found }
    put:
      tags: [Payments]
      summary: Update payment
      parameters:
        - in: path
          name: id
          required: true
          schema: { type: integer }
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                paid_amount: { type: number }
                balance: { type: number }
                status: { type: string }
                payment_method: { type: string }
                payment_date: { type: string, format: date }
                check_number: { type: string }
      responses:
        "200": { description: Payment updated }
    delete:
      tags: [Payments]
      summary: Delete payment
      parameters:
        - in: path
          name: id
          required: true
          schema: { type: integer }
      responses:
        "200": { description: Payment deleted }

  /payments/parent/{id}:
    get:
      tags: [Payments]
      summary: List payments by parent
      parameters:
        - in: path
          name: id
          required: true
          schema: { type: integer }
      responses:
        "200": { description: Parent payments list }