openapi: 3.0.3
info:
  title: KOMOJU Barcodes Payment Methods API
  description: 'KOMOJU is a Japan-focused global payment gateway operated by Degica. The REST API accepts payments across Japanese and international payment methods - credit cards, convenience store (konbini), bank transfer, Pay-easy (ATM), and e-money / mobile wallets such as PayPay, Merpay, au PAY, Rakuten Pay, LINE Pay, Alipay, and WeChat Pay - plus a hosted checkout (Sessions), tokenization, saved customers, subscriptions, and webhook events.


    Base URL: https://komoju.com/api/v1. Authentication is HTTP Basic: send your secret (or publishable, where allowed) API key as the username and leave the password empty (for example `curl -u secret_key: ...`). Separate live and test key pairs are issued per merchant account. POST requests support idempotency via the `X-KOMOJU-IDEMPOTENCY` header, and an optional `X-KOMOJU-API-VERSION` header pins the API version.


    This description is grounded in the public KOMOJU API reference (doc.komoju.com). Paths, methods, and authentication are confirmed against that reference. Request/response schemas below are a representative, partly modeled subset - some object properties are simplified or marked additionalProperties where the full field list is extensive; consult the official reference for exhaustive field-level detail.'
  version: '1.0'
  contact:
    name: KOMOJU (Degica)
    url: https://en.komoju.com
  license:
    name: Proprietary
    url: https://en.komoju.com/terms/
servers:
- url: https://komoju.com/api/v1
  description: KOMOJU API (live and test share this host; the key pair selects the environment)
security:
- basicAuth: []
tags:
- name: Payment Methods
  description: List the payment methods available to the authenticated merchant.
paths:
  /payment_methods:
    get:
      operationId: listPaymentMethods
      tags:
      - Payment Methods
      summary: List payment methods
      description: Lists the payment methods available to the authenticated merchant (for example credit_card, konbini, bank_transfer, pay_easy, paypay, merpay, au_pay, rakutenpay, linepay, alipay, wechatpay, paidy).
      parameters:
      - name: amount
        in: query
        required: false
        schema:
          type: integer
      - name: currency
        in: query
        required: false
        schema:
          type: string
          example: JPY
      responses:
        '200':
          description: A list of available payment methods.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/PaymentMethod'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  responses:
    Unauthorized:
      description: Invalid authorization (missing or invalid API key).
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
            message:
              type: string
            param:
              type: string
    PaymentMethod:
      type: object
      properties:
        type:
          type: string
          example: konbini
        brands:
          type: array
          items:
            type: string
        currencies:
          type: array
          items:
            type: string
      additionalProperties: true
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: 'HTTP Basic Authentication. Use your KOMOJU API key as the username and leave the password empty (for example `curl -u secret_key: ...`). Secret keys grant full access; publishable keys are limited to creating tokens and paying for sessions. Separate live and test key pairs exist per merchant.'