Twilio Schedule a Message and Cancel It Before Send

arazzo: 1.0.1
info:
  title: Twilio Schedule a Message and Cancel It Before Send
  summary: Schedule a future message via a messaging service, then cancel it while it is still scheduled.
  description: >-
    A scheduled messaging control pattern. The workflow schedules a message for
    future delivery through a messaging service using a fixed schedule type and
    a send-at time, then fetches the message to confirm it is in the scheduled
    state, and finally cancels it by updating its status to canceled while it is
    still queued. 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: messagesApi
  url: ../openapi/twilio-messages-api-openapi.yml
  type: openapi
workflows:
- workflowId: schedule-and-cancel-message
  summary: Schedule a message, confirm it is scheduled, then cancel it.
  description: >-
    Creates a scheduled message via a messaging service, fetches it to confirm
    the scheduled state, and cancels it while still queued.
  inputs:
    type: object
    required:
    - accountSid
    - to
    - messagingServiceSid
    - body
    - sendAt
    properties:
      accountSid:
        type: string
        description: The Twilio account SID (starts with AC).
      to:
        type: string
        description: Recipient phone number in E.164 format.
      messagingServiceSid:
        type: string
        description: SID (starts with MG) of the messaging service to schedule through.
      body:
        type: string
        description: The text content of the scheduled message.
      sendAt:
        type: string
        description: ISO 8601 time to send the scheduled message.
  steps:
  - stepId: scheduleMessage
    description: >-
      Schedule the message for future delivery through the messaging service.
    operationId: createMessage
    parameters:
    - name: AccountSid
      in: path
      value: $inputs.accountSid
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        To: $inputs.to
        MessagingServiceSid: $inputs.messagingServiceSid
        Body: $inputs.body
        SendAt: $inputs.sendAt
        ScheduleType: fixed
    successCriteria:
    - condition: $statusCode == 201
    outputs:
      messageSid: $response.body#/sid
      status: $response.body#/status
  - stepId: confirmScheduled
    description: >-
      Fetch the message to confirm it is in the scheduled state before
      cancelling.
    operationId: fetchMessage
    parameters:
    - name: AccountSid
      in: path
      value: $inputs.accountSid
    - name: MessageSid
      in: path
      value: $steps.scheduleMessage.outputs.messageSid
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      status: $response.body#/status
    onSuccess:
    - name: scheduled
      type: goto
      stepId: cancelMessage
      criteria:
      - context: $response.body
        condition: $.status == "scheduled"
        type: jsonpath
    - name: notScheduled
      type: end
      criteria:
      - context: $response.body
        condition: $.status != "scheduled"
        type: jsonpath
  - stepId: cancelMessage
    description: >-
      Cancel the still-queued scheduled message by updating its status to
      canceled.
    operationId: updateMessage
    parameters:
    - name: AccountSid
      in: path
      value: $inputs.accountSid
    - name: MessageSid
      in: path
      value: $steps.scheduleMessage.outputs.messageSid
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        Status: canceled
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      finalStatus: $response.body#/status
  outputs:
    messageSid: $steps.scheduleMessage.outputs.messageSid
    finalStatus: $steps.cancelMessage.outputs.finalStatus