> ## Documentation Index
> Fetch the complete documentation index at: https://docs.greentick.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# List contact attributes

> Lists custom attribute definitions for the connected phone number. Use attribute ids when setting contact.attributes values.



## OpenAPI

````yaml /openapi.json get /attributes
openapi: 3.1.0
info:
  title: GreenTick Developer API
  version: 1.0.0
  summary: WhatsApp messaging, contacts, workflows, and webhooks
  description: >-
    Use GreenTick's REST API to send WhatsApp messages, synchronize contacts,
    trigger workflows, and receive signed event webhooks. Each API key belongs
    to one connected phone number.
  contact:
    name: GreenTick Support
    url: https://greentick.ai
servers:
  - url: https://api.greentick.ai/v1
    description: GreenTick API v1
security: []
tags:
  - name: System
    description: Health and API metadata
  - name: Messages
    description: Send WhatsApp messages
  - name: Conversations
    description: List inbox threads and fetch message history
  - name: Templates
    description: Discover approved templates and their variables
  - name: Contacts
    description: Synchronize customer contacts
  - name: Labels
    description: Contact label catalog for the connected phone number
  - name: Attributes
    description: Contact custom attribute definitions for the connected phone number
  - name: Phone numbers
    description: WhatsApp sending line for this phone number
  - name: Automations
    description: List enrollable automations and start one for a contact
  - name: Workflow hooks
    description: Trigger GreenTick automations from external systems
  - name: Webhooks
    description: Subscribe Zapier, Make.com, or your own server to GreenTick events
  - name: API key
    description: Check the Bearer API key and account timezone
  - name: MCP platform
    description: Limits, usage, and shared connector behavior
  - name: Media
    description: Host customer-supplied files
  - name: Workflows
    description: Create, publish, and export automations
  - name: Flows
    description: WhatsApp Flows
  - name: AI bots
    description: AI bots and knowledge
  - name: Broadcasts
    description: Template broadcasts
  - name: Catalogs
    description: Commerce catalogs, products, and orders
  - name: Ads
    description: Click-to-WhatsApp ads and conversions
paths:
  /attributes:
    get:
      tags:
        - Attributes
      summary: List contact attributes
      description: >-
        Lists custom attribute definitions for the connected phone number. Use
        attribute ids when setting contact.attributes values.
      operationId: listAttributes
      responses:
        '200':
          description: Attributes
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                    example: true
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Attribute'
                  total:
                    type: integer
        '401':
          $ref: '#/components/responses/Unauthorized'
      security:
        - apiKey: []
components:
  schemas:
    Attribute:
      type: object
      properties:
        id:
          type: string
        name:
          type: string
          example: city
        createdAt:
          type: string
          format: date-time
        updatedAt:
          type: string
          format: date-time
  responses:
    Unauthorized:
      description: Missing, invalid, or revoked API key
      content:
        application/json:
          schema:
            type: object
            required:
              - success
              - code
              - message
            properties:
              success:
                type: boolean
                example: false
              code:
                type: string
                example: INVALID_TO
              message:
                type: string
                example: to (E.164 phone) is required
  securitySchemes:
    apiKey:
      type: http
      scheme: bearer
      bearerFormat: gt_live_…
      description: >-
        Create an API key in GreenTick Developer settings. Send it as
        Authorization: Bearer gt_live_… (Bearer prefix required).

````

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