Salesforce Marketing Cloud Send a Triggered Email

arazzo: 1.0.1
info:
  title: Salesforce Marketing Cloud Send a Triggered Email
  summary: Authenticate, fire a triggered email send, then poll the recipient's send status.
  description: >-
    A transactional messaging pattern for Marketing Cloud. The workflow obtains
    an OAuth 2.0 access token, submits a triggered email send referencing a
    triggered send definition with one or more recipients, captures the recipient
    send id returned for the request, and then reads the delivery status for that
    recipient using its message key. Every step spells out its request inline so
    the flow can be read and executed without opening the underlying OpenAPI
    description.
  version: 1.0.0
sourceDescriptions:
- name: salesforceMarketingCloudApi
  url: ../openapi/salesforce-marketing-cloud-rest-openapi.yml
  type: openapi
workflows:
- workflowId: send-triggered-email
  summary: Trigger a Marketing Cloud email send and read its delivery status.
  description: >-
    Acquires an access token, initiates a triggered email send to the supplied
    recipient using a triggered send definition key, then retrieves the send
    status for the recipient send id returned by the send request.
  inputs:
    type: object
    required:
    - clientId
    - clientSecret
    - definitionKey
    - contactKey
    properties:
      clientId:
        type: string
        description: The client ID of the Marketing Cloud installed package API integration.
      clientSecret:
        type: string
        description: The client secret of the Marketing Cloud installed package API integration.
      definitionKey:
        type: string
        description: The external key of the triggered send definition in Email Studio.
      contactKey:
        type: string
        description: The subscriber key of the email recipient.
      to:
        type: string
        description: Optional recipient email address overriding the subscriber's stored address.
      attributes:
        type: object
        description: Key-value personalization attributes for the recipient.
  steps:
  - stepId: authenticate
    description: >-
      Obtain an OAuth 2.0 access token using the client credentials grant for
      server-to-server access to the Marketing Cloud REST API.
    operationId: getAccessToken
    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
      restInstanceUrl: $response.body#/rest_instance_url
  - stepId: sendEmail
    description: >-
      Submit a triggered email send to the recipient using the supplied
      triggered send definition key and personalization attributes.
    operationId: createEmailSend
    requestBody:
      contentType: application/json
      payload:
        definitionKey: $inputs.definitionKey
        recipients:
        - contactKey: $inputs.contactKey
          to: $inputs.to
          attributes: $inputs.attributes
    successCriteria:
    - condition: $statusCode == 202
    outputs:
      requestId: $response.body#/requestId
      recipientSendId: $response.body#/responses/0/recipientSendId
      hasErrors: $response.body#/responses/0/hasErrors
  - stepId: getSendStatus
    description: >-
      Read the delivery status for the recipient using the recipient send id
      returned by the send request as the message key.
    operationId: getMessageStatus
    parameters:
    - name: messageKey
      in: path
      value: $steps.sendEmail.outputs.recipientSendId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      eventCategoryType: $response.body#/eventCategoryType
      timestamp: $response.body#/timestamp
      subscriberKey: $response.body#/subscriberKey
  outputs:
    requestId: $steps.sendEmail.outputs.requestId
    recipientSendId: $steps.sendEmail.outputs.recipientSendId
    deliveryStatus: $steps.getSendStatus.outputs.eventCategoryType