Mailchimp Create Merge Field and Add Member

arazzo: 1.0.1
info:
  title: Mailchimp Create Merge Field and Add Member
  summary: Add a custom audience field, then add a member that populates it.
  description: >-
    Extends an audience's data model and immediately uses it. The workflow
    creates a new merge field (audience field) on a list, then adds a subscriber
    whose merge_fields payload populates the new field by its merge tag. This
    pairs the schema change and the first data write so a custom field is never
    left empty on its first contact. Note: merge_fields is keyed by the literal
    merge tag, so the example payload uses a placeholder key (MERGEFIELD) that
    must be replaced with the actual tag value (Arazzo runtime expressions
    cannot supply an object key dynamically). Authentication uses HTTP Basic
    auth with any username and your Mailchimp API key as the password.
  version: 1.0.0
sourceDescriptions:
- name: listsApi
  url: ../openapi/mailchimp-lists-api-openapi.yml
  type: openapi
workflows:
- workflowId: create-merge-field-add-member
  summary: Create a merge field, then add a member that fills it in.
  description: >-
    Creates a merge field on the audience and adds a member whose merge_fields
    populate it.
  inputs:
    type: object
    required:
    - listId
    - mergeFieldName
    - mergeFieldType
    - mergeTag
    - emailAddress
    - mergeFieldValue
    properties:
      listId:
        type: string
        description: The unique id for the audience/list.
      mergeFieldName:
        type: string
        description: The display name of the merge field.
      mergeFieldType:
        type: string
        description: The merge field type (text, number, date, address, etc.).
      mergeTag:
        type: string
        description: The merge tag the field is referenced by (e.g. BIRTHDAY).
      emailAddress:
        type: string
        description: Email address of the subscriber to add.
      status:
        type: string
        description: Subscription status for the new member.
        default: subscribed
      mergeFieldValue:
        type: string
        description: The value to write into the new merge field for this member.
  steps:
  - stepId: createMergeField
    description: Create the custom merge field on the audience.
    operationId: postListsIdMergeFields
    parameters:
    - name: list_id
      in: path
      value: $inputs.listId
    requestBody:
      contentType: application/json
      payload:
        name: $inputs.mergeFieldName
        type: $inputs.mergeFieldType
        tag: $inputs.mergeTag
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      mergeId: $response.body#/merge_id
      mergeTag: $response.body#/tag
  - stepId: addMember
    description: >-
      Add a subscriber whose merge_fields populate the newly created field by
      its merge tag.
    operationId: postListsIdMembers
    parameters:
    - name: list_id
      in: path
      value: $inputs.listId
    requestBody:
      contentType: application/json
      payload:
        email_address: $inputs.emailAddress
        status: $inputs.status
        merge_fields:
          MERGEFIELD: $inputs.mergeFieldValue
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      memberId: $response.body#/id
  outputs:
    mergeId: $steps.createMergeField.outputs.mergeId
    memberId: $steps.addMember.outputs.memberId