Cellulant Checkout with SMS Notification

arazzo: 1.0.1
info:
  title: Cellulant Checkout with SMS Notification
  summary: Create an Express Checkout, then text the customer the short payment URL over Tingg Engage.
  description: >-
    Pairs the Tingg Checkout and Engage APIs to deliver a pay-by-link
    experience. The workflow authenticates against the Checkout API, raises an
    Express Checkout that returns a short_url, and then sends that link to the
    customer by SMS through the Engage API so they can complete payment from
    their phone. Because the two operations live in different OpenAPI
    descriptions, each step references its operation through the explicit
    sourceDescriptions form. Each step inlines its bearer token and, for the
    checkout call, the merchant apikey header.
  version: 1.0.0
sourceDescriptions:
- name: checkoutApi
  url: ../openapi/cellulant-checkout-api-openapi.yml
  type: openapi
- name: engageApi
  url: ../openapi/cellulant-engage-api-openapi.yml
  type: openapi
workflows:
- workflowId: checkout-with-sms-notification
  summary: Create a checkout and SMS the short payment link to the customer.
  description: >-
    Authenticates, creates an Express Checkout, and sends the resulting short
    URL to the customer over SMS via Tingg Engage.
  inputs:
    type: object
    required:
    - clientId
    - clientSecret
    - apiKey
    - merchantTransactionId
    - serviceCode
    - countryCode
    - currencyCode
    - requestAmount
    - callbackUrl
    - msisdn
    - engageReferenceId
    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 to receive the SMS.
      engageReferenceId:
        type: string
        description: Reference id for the Engage SMS request.
      senderId:
        type: string
        description: Sender id (mask) for the outbound SMS.
  steps:
  - stepId: authenticate
    description: >-
      Exchange the client credentials for a bearer access token used to
      authorize the checkout call.
    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: createCheckout
    description: >-
      Create a hosted Express Checkout and capture the short_url to send to the
      customer.
    operationId: createExpressCheckout
    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
        msisdn: $inputs.msisdn
        callback_url: $inputs.callbackUrl
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      checkoutRequestId: $response.body#/checkout_request_id
      shortUrl: $response.body#/short_url
  - stepId: sendPaymentLink
    description: >-
      Send the short payment URL to the customer by SMS through Tingg Engage so
      they can complete the checkout from their phone.
    operationId: sendEngagement
    parameters:
    - name: Authorization
      in: header
      value: "Bearer $steps.authenticate.outputs.accessToken"
    requestBody:
      contentType: application/json
      payload:
        notificationType: TRX
        channels:
        - SMS
        referenceID: $inputs.engageReferenceId
        smsDto:
          msisdn:
          - $inputs.msisdn
          message: "Complete your payment here: ${link}"
          params:
            link: $steps.createCheckout.outputs.shortUrl
          senderID: $inputs.senderId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      engagementTransactionId: $response.body#/transactionID
  outputs:
    checkoutRequestId: $steps.createCheckout.outputs.checkoutRequestId
    shortUrl: $steps.createCheckout.outputs.shortUrl
    engagementTransactionId: $steps.sendPaymentLink.outputs.engagementTransactionId