Tango Configure Low Balance Alert

arazzo: 1.0.1
info:
  title: Tango Configure Low Balance Alert
  summary: Confirm an account exists, set a low balance alert on it, and verify the alert.
  description: >-
    A proactive funding-monitoring pattern. The workflow reads the account to
    confirm it exists and capture its current balance, creates a low balance
    alert that emails a contact when the balance drops below a threshold, and
    reads the alert back to verify it was registered. Every step spells out its
    request inline so the flow can be read and executed without opening the
    underlying OpenAPI description. Authentication uses the platform's HTTP Basic
    credentials declared by the basicAuth security scheme; those credentials are
    applied at the transport layer and are not request parameters.
  version: 1.0.0
sourceDescriptions:
- name: accountsApi
  url: ../openapi/tango-accounts-api-openapi.yml
  type: openapi
- name: lowBalanceAlertsApi
  url: ../openapi/tango-low-balance-alerts-api-openapi.yml
  type: openapi
workflows:
- workflowId: configure-low-balance-alert
  summary: Confirm the account, create a low balance alert, and verify it.
  description: >-
    Reads the account to confirm it exists, sets a low balance alert threshold
    with a notification email, and reads the alert back to verify it.
  inputs:
    type: object
    required:
    - customerIdentifier
    - accountIdentifier
    - threshold
    - emailAddress
    properties:
      customerIdentifier:
        type: string
        description: Customer that owns the account.
      accountIdentifier:
        type: string
        description: Account to monitor for low balance.
      threshold:
        type: number
        description: Alert when the balance drops below this amount.
      emailAddress:
        type: string
        description: Email address to notify when the threshold is crossed.
  steps:
  - stepId: confirmAccount
    description: >-
      Read the account to confirm it exists and capture its current balance
      before configuring an alert.
    operationId: getAccount
    parameters:
    - name: customerIdentifier
      in: path
      value: $inputs.customerIdentifier
    - name: accountIdentifier
      in: path
      value: $inputs.accountIdentifier
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      accountIdentifier: $response.body#/accountIdentifier
      currentBalance: $response.body#/currentBalance
  - stepId: createAlert
    description: >-
      Create a low balance alert that notifies the supplied email when the
      account balance falls below the threshold.
    operationId: createLowBalanceAlert
    parameters:
    - name: customerIdentifier
      in: path
      value: $inputs.customerIdentifier
    - name: accountIdentifier
      in: path
      value: $steps.confirmAccount.outputs.accountIdentifier
    requestBody:
      contentType: application/json
      payload:
        threshold: $inputs.threshold
        emailAddress: $inputs.emailAddress
    successCriteria:
    - condition: $statusCode == 201
    outputs:
      balanceAlertID: $response.body#/balanceAlertID
  - stepId: verifyAlert
    description: >-
      Read the alert back by id to verify it was registered with the expected
      threshold.
    operationId: getLowBalanceAlert
    parameters:
    - name: customerIdentifier
      in: path
      value: $inputs.customerIdentifier
    - name: accountIdentifier
      in: path
      value: $steps.confirmAccount.outputs.accountIdentifier
    - name: balanceAlertID
      in: path
      value: $steps.createAlert.outputs.balanceAlertID
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      balanceAlertID: $response.body#/balanceAlertID
      threshold: $response.body#/threshold
      alertStatus: $response.body#/status
  outputs:
    balanceAlertID: $steps.verifyAlert.outputs.balanceAlertID
    threshold: $steps.verifyAlert.outputs.threshold
    currentBalance: $steps.confirmAccount.outputs.currentBalance