Cellulant Custom Checkout, Charge, and Poll

arazzo: 1.0.1
info:
  title: Cellulant Custom Checkout, Charge, and Poll
  summary: Host-to-host flow — authenticate, initiate a custom checkout, push the charge prompt, then poll until the payment resolves.
  description: >-
    The merchant-controlled (host-to-host) Tingg payment flow. The workflow
    issues a bearer access token, initiates a Custom Checkout to obtain a
    checkout_request_id, posts a charge request to push the USSD/STK prompt or
    card charge to the customer, and then polls query-status by
    merchant_transaction_id until a payment is reported. Each step inlines its
    bearer token and merchant apikey header so the flow reads and runs without
    opening the OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: checkoutApi
  url: ../openapi/cellulant-checkout-api-openapi.yml
  type: openapi
workflows:
- workflowId: custom-checkout-charge-and-poll
  summary: Initiate a custom checkout, charge the customer, and poll until the payment is resolved.
  description: >-
    Authenticates, initiates a host-to-host checkout, posts the charge request
    that prompts the customer to pay, and polls the request status until a
    payment lands.
  inputs:
    type: object
    required:
    - clientId
    - clientSecret
    - apiKey
    - merchantTransactionId
    - serviceCode
    - countryCode
    - currencyCode
    - requestAmount
    - callbackUrl
    - paymentOptionCode
    - msisdn
    properties:
      clientId:
        type: string
        description: OAuth client id issued in the Tingg dashboard.
      clientSecret:
        type: string
        description: OAuth client secret issued in the Tingg dashboard.
      apiKey:
        type: string
        description: Merchant apikey header value issued in the Tingg dashboard.
      merchantTransactionId:
        type: string
        description: Unique merchant transaction id for this checkout.
      serviceCode:
        type: string
        description: Tingg service code identifying the merchant product line.
      countryCode:
        type: string
        description: ISO 3166-1 alpha-2 country code.
      currencyCode:
        type: string
        description: ISO 4217 currency code.
      requestAmount:
        type: number
        description: Amount to charge the customer.
      callbackUrl:
        type: string
        description: IPN callback URL Tingg posts the payment result to.
      payerMode:
        type: string
        description: Custom checkout payer mode (MOBILE, BANK, or CARD).
      paymentOptionCode:
        type: string
        description: Payment option code identifying the rail to charge.
      msisdn:
        type: string
        description: Customer phone in E.164 format to receive the charge prompt.
  steps:
  - stepId: authenticate
    description: >-
      Exchange the client credentials for a bearer access token used to
      authorize the checkout and charge calls.
    operationId: requestAccessToken
    requestBody:
      contentType: application/json
      payload:
        grant_type: client_credentials
        client_id: $inputs.clientId
        client_secret: $inputs.clientSecret
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      accessToken: $response.body#/access_token
  - stepId: initiateCheckout
    description: >-
      Initiate a host-to-host custom checkout and capture the
      checkout_request_id used to drive the charge.
    operationId: initiateCustomCheckout
    parameters:
    - name: apikey
      in: header
      value: $inputs.apiKey
    - name: Authorization
      in: header
      value: "Bearer $steps.authenticate.outputs.accessToken"
    requestBody:
      contentType: application/json
      payload:
        merchant_transaction_id: $inputs.merchantTransactionId
        service_code: $inputs.serviceCode
        country_code: $inputs.countryCode
        currency_code: $inputs.currencyCode
        request_amount: $inputs.requestAmount
        callback_url: $inputs.callbackUrl
        msisdn: $inputs.msisdn
        payer_mode: $inputs.payerMode
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      checkoutRequestId: $response.body#/checkout_request_id
  - stepId: chargeCustomer
    description: >-
      Post the charge request against the initiated checkout to push the
      USSD/STK prompt or card charge to the customer.
    operationId: initiateChargeRequest
    parameters:
    - name: apikey
      in: header
      value: $inputs.apiKey
    - name: Authorization
      in: header
      value: "Bearer $steps.authenticate.outputs.accessToken"
    requestBody:
      contentType: application/json
      payload:
        checkout_request_id: $steps.initiateCheckout.outputs.checkoutRequestId
        merchant_transaction_id: $inputs.merchantTransactionId
        service_code: $inputs.serviceCode
        payment_option_code: $inputs.paymentOptionCode
        msisdn: $inputs.msisdn
        amount: $inputs.requestAmount
        currency_code: $inputs.currencyCode
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      cpgTransactionId: $response.body#/cpg_transaction_id
      chargeStatusCode: $response.body#/status_code
  - stepId: pollStatus
    description: >-
      Query the request status by merchant_transaction_id. Repeat while the
      charge is in flight; end once a payment is reported.
    operationId: queryRequestStatus
    parameters:
    - name: apikey
      in: header
      value: $inputs.apiKey
    - name: Authorization
      in: header
      value: "Bearer $steps.authenticate.outputs.accessToken"
    - name: merchant_transaction_id
      in: query
      value: $inputs.merchantTransactionId
    - name: service_code
      in: query
      value: $inputs.serviceCode
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      requestStatusCode: $response.body#/request_status_code
      payments: $response.body#/payments
    onSuccess:
    - name: paymentSettled
      type: end
      criteria:
      - context: $response.body
        condition: $.payments.length > 0
        type: jsonpath
    - name: stillPending
      type: goto
      stepId: pollStatus
      criteria:
      - context: $response.body
        condition: $.payments.length == 0
        type: jsonpath
  outputs:
    checkoutRequestId: $steps.initiateCheckout.outputs.checkoutRequestId
    cpgTransactionId: $steps.chargeCustomer.outputs.cpgTransactionId
    requestStatusCode: $steps.pollStatus.outputs.requestStatusCode
    payments: $steps.pollStatus.outputs.payments