Cellulant Charge with OTP Notification

arazzo: 1.0.1
info:
  title: Cellulant Charge with OTP Notification
  summary: Initiate a custom checkout, send the customer an OTP by SMS, then push the charge request.
  description: >-
    A host-to-host payment flow that layers an out-of-band OTP on top of the
    Tingg charge. The workflow authenticates, initiates a Custom Checkout to
    obtain a checkout_request_id, delivers a one-time passcode to the customer
    by SMS through the Engage API, and then posts the charge request to debit
    the customer. The OTP step uses the Engage API while the checkout and charge
    steps use the Checkout API, so each operation is referenced through the
    explicit sourceDescriptions form. Each step inlines its bearer token and,
    for checkout calls, the merchant apikey header.
  version: 1.0.0
sourceDescriptions:
- name: authenticationApi
  url: ../openapi/cellulant-authentication-api-openapi.yml
  type: openapi
- name: customCheckoutApi
  url: ../openapi/cellulant-custom-checkout-api-openapi.yml
  type: openapi
- name: engagementApi
  url: ../openapi/cellulant-engagement-api-openapi.yml
  type: openapi
workflows:
- workflowId: charge-with-otp-notification
  summary: Initiate a custom checkout, SMS an OTP, then charge the customer.
  description: >-
    Authenticates, initiates a host-to-host checkout, delivers an OTP by SMS,
    and posts the charge request to debit the customer.
  inputs:
    type: object
    required:
    - clientId
    - clientSecret
    - apiKey
    - merchantTransactionId
    - serviceCode
    - countryCode
    - currencyCode
    - requestAmount
    - callbackUrl
    - msisdn
    - paymentOptionCode
    - otpReferenceId
    - otpCode
    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.
      msisdn:
        type: string
        description: Customer phone in E.164 format.
      payerMode:
        type: string
        description: Custom checkout payer mode (MOBILE, BANK, or CARD).
      paymentOptionCode:
        type: string
        description: Payment option code identifying the rail to charge.
      otpReferenceId:
        type: string
        description: Reference id for the Engage OTP request.
      otpCode:
        type: string
        description: The one-time passcode value to substitute into the OTP message.
      senderId:
        type: string
        description: Sender id (mask) for the outbound OTP SMS.
  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.
    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: sendOtp
    description: >-
      Deliver a one-time passcode to the customer by SMS through Tingg Engage.
    operationId: sendEngagement
    parameters:
    - name: Authorization
      in: header
      value: "Bearer $steps.authenticate.outputs.accessToken"
    requestBody:
      contentType: application/json
      payload:
        notificationType: OTP
        channels:
        - SMS
        referenceID: $inputs.otpReferenceId
        smsDto:
          msisdn:
          - $inputs.msisdn
          message: "Your payment OTP is ${code}. Valid for 5 minutes."
          params:
            code: $inputs.otpCode
          senderID: $inputs.senderId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      otpTransactionId: $response.body#/transactionID
  - stepId: chargeCustomer
    description: >-
      Post the charge request against the initiated checkout to debit the
      customer once the OTP has been delivered.
    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
  outputs:
    checkoutRequestId: $steps.initiateCheckout.outputs.checkoutRequestId
    otpTransactionId: $steps.sendOtp.outputs.otpTransactionId
    cpgTransactionId: $steps.chargeCustomer.outputs.cpgTransactionId