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OpenAPI Specification

openapi: 3.2.0
info:
  title: Juspay Express Checkout Session API
  description: Server-to-server REST API for the Juspay payments orchestration and checkout platform.
  version: '1.0'
  contact:
    name: Juspay
    url: https://juspay.io/in
servers:
- url: https://api.juspay.in
  description: Production
- url: https://sandbox.juspay.in
  description: Sandbox
security:
- basicAuth: []
tags:
- name: Session
  description: Create a payment session for the Hyper Checkout / HyperSDK.
paths:
  /session:
    post:
      operationId: createSession
      tags:
      - Session
      summary: Create a payment session
      description: Creates a payment session for the Hyper Checkout / HyperSDK. Accepts order parameters and returns an SDK payload and payment links used to initialize the drop-in checkout on web or mobile.
      parameters:
      - $ref: '#/components/parameters/MerchantId'
      - $ref: '#/components/parameters/RoutingId'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SessionInput'
      responses:
        '200':
          description: SDK payload and payment links for the session.
          content:
            application/json:
              schema:
                type: object
                additionalProperties: true
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  responses:
    Unauthorized:
      description: Missing or invalid credentials.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  parameters:
    RoutingId:
      name: x-routing-id
      in: header
      required: false
      description: Routing key that pins the payment session lifecycle - typically the customer_id, or an order/cart id for guest checkout.
      schema:
        type: string
    MerchantId:
      name: x-merchantid
      in: header
      required: true
      description: Merchant ID issued by Juspay.
      schema:
        type: string
  schemas:
    Error:
      type: object
      properties:
        status:
          type: string
        error_code:
          type: string
        error_message:
          type: string
    SessionInput:
      type: object
      required:
      - order_id
      - amount
      - customer_id
      properties:
        order_id:
          type: string
        amount:
          type: number
          format: double
        customer_id:
          type: string
        currency:
          type: string
          default: INR
        return_url:
          type: string
          format: uri
        payment_page_client_id:
          type: string
        action:
          type: string
          description: e.g. paymentPage.
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: 'HTTP Basic authentication. The API key is the username and the password is an empty string; the pair is Base64-encoded into `Authorization: Basic <credentials>`. An `x-merchantid` header is also required on requests.'