openapi: 3.0.3
info:
  title: OpenCart REST Affiliates Payment Methods API
  description: 'The OpenCart REST API enables external applications to communicate with a self-hosted OpenCart store. It provides endpoints for managing the shopping cart, customers, orders, addresses, shipping methods, payment methods, subscriptions, and affiliates. Authentication is performed by submitting API credentials to receive a session token, which must accompany subsequent requests. IP-allowlist enforcement is applied at the store level.

    '
  version: '4.0'
  contact:
    name: OpenCart Developer Documentation
    url: https://docs.opencart.com/developer/
  license:
    name: GNU GPL v3
    url: https://github.com/opencart/opencart/blob/master/LICENSE.md
servers:
- url: https://yourstore.com/index.php?route=api
  description: OpenCart store API base URL (replace yourstore.com with your store domain)
security:
- apiToken: []
tags:
- name: Payment Methods
  description: Available payment method retrieval and selection
paths:
  /payment_method:
    post:
      operationId: setPaymentMethod
      summary: Set the payment method for the order
      description: 'Stores the selected payment method in the session. Requires customer, cart products, and if applicable, a payment address.

        '
      tags:
      - Payment Methods
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              type: object
              required:
              - name
              - code
              properties:
                api_token:
                  type: string
                name:
                  type: string
                  description: Human-readable name of the payment method
                  example: Bank Transfer
                code:
                  type: string
                  description: Machine code of the payment method
                  example: bank_transfer
      responses:
        '200':
          description: Payment method set or error
          content:
            application/json:
              schema:
                oneOf:
                - $ref: '#/components/schemas/SuccessResponse'
                - $ref: '#/components/schemas/ErrorResponse'
  /payment_method/getPaymentMethods:
    get:
      operationId: getPaymentMethods
      summary: Retrieve available payment methods
      description: 'Returns the list of available payment methods for the current session. Requires customer data, cart products, and if shipping is required, a shipping address and method.

        '
      tags:
      - Payment Methods
      parameters:
      - $ref: '#/components/parameters/ApiToken'
      responses:
        '200':
          description: Available payment methods or error
          content:
            application/json:
              schema:
                oneOf:
                - type: object
                  properties:
                    payment_methods:
                      type: array
                      items:
                        $ref: '#/components/schemas/PaymentMethod'
                - $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    SuccessResponse:
      type: object
      properties:
        success:
          type: string
          description: Localised success message
          example: 'Success: You have modified your shopping cart!'
    PaymentMethod:
      type: object
      properties:
        code:
          type: string
          example: bank_transfer
        name:
          type: string
          example: Bank Transfer
        sort_order:
          type: integer
          example: 1
    ErrorResponse:
      type: object
      properties:
        error:
          type: string
          description: Localised error message
          example: 'Warning: Permission Denied!'
  parameters:
    ApiToken:
      name: api_token
      in: query
      required: true
      schema:
        type: string
      description: Session token from the login endpoint
  securitySchemes:
    apiToken:
      type: apiKey
      in: query
      name: api_token
      description: Session token obtained from the /login endpoint
externalDocs:
  description: OpenCart Admin API Documentation
  url: https://docs.opencart.com/admin-interface/system/users/api