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

# Create Contact Property

> Creates a typed custom property definition for contacts. Property keys are unique within the team.



## OpenAPI

````yaml /openapi.json post /contact-properties
openapi: 3.1.0
info:
  title: Dugble API
  description: >-
    Programmatic access to Dugble email, SMS, sending infrastructure, contacts,
    audiences, suppressions, and broadcasts. Authenticate with a team token sent
    as a Bearer token.
  version: 1.0.0
  contact:
    name: Dugble Support
    email: support@dugble.com
servers:
  - url: https://api.dugble.com
    description: Production
security:
  - BearerAuth: []
tags:
  - name: Email
    description: Send and manage transactional emails.
  - name: SMS
    description: Send and manage SMS messages.
  - name: Domains
    description: Manage and verify sending domains.
  - name: Templates
    description: Create, version, publish, preview, and test reusable email templates.
  - name: Sender IDs
    description: Manage SMS sender IDs.
  - name: Contacts
    description: Manage contacts and their audience memberships.
  - name: Contact Properties
    description: Manage typed custom property definitions used by contacts.
  - name: Topics
    description: Manage contact subscription topics.
  - name: Segments
    description: Manage audience segments.
  - name: Suppressions
    description: Manage suppressed email recipients.
  - name: Broadcasts
    description: Create, schedule, and analyze email broadcasts.
paths:
  /contact-properties:
    post:
      tags:
        - Contact Properties
      summary: Create Contact Property
      description: >-
        Creates a typed custom property definition for contacts. Property keys
        are unique within the team.
      operationId: createContactProperty
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ContactPropertyCreateRequest'
            examples:
              stringProperty:
                summary: String property
                value:
                  key: company_name
                  type: string
                  fallback_value: Unknown
              numberProperty:
                summary: Number property
                value:
                  key: lifetime_value
                  type: number
                  fallback_value: 0
      responses:
        '200':
          description: Contact property created successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ContactPropertyMutationEnvelope'
        default:
          $ref: '#/components/responses/Error'
components:
  schemas:
    ContactPropertyCreateRequest:
      type: object
      required:
        - key
        - type
      properties:
        key:
          type: string
          minLength: 1
          maxLength: 50
          pattern: ^[A-Za-z0-9_]+$
          description: >-
            Unique property key containing only letters, numbers, and
            underscores.
        type:
          type: string
          enum:
            - string
            - number
          description: Declared value type for the property.
        fallback_value:
          $ref: '#/components/schemas/ContactPropertyValue'
      additionalProperties: false
    ContactPropertyMutationEnvelope:
      type: object
      required:
        - success
        - data
      properties:
        success:
          type: boolean
          enum:
            - true
        data:
          $ref: '#/components/schemas/ContactPropertyMutation'
    ContactPropertyValue:
      oneOf:
        - type: string
        - type: number
        - type: 'null'
      description: >-
        Fallback value. Non-null values must match the contact property's
        declared type.
    ContactPropertyMutation:
      type: object
      required:
        - object
        - id
      properties:
        object:
          type: string
          enum:
            - contact_property
        id:
          type: string
          format: uuid
    ErrorEnvelope:
      type: object
      required:
        - success
        - error
      properties:
        success:
          type: boolean
          enum:
            - false
        error:
          type: object
          required:
            - code
            - message
          properties:
            code:
              type: string
              enum:
                - BAD_REQUEST
                - UNAUTHORIZED
                - FORBIDDEN
                - STEP_UP_REQUIRED
                - NOT_FOUND
                - CONFLICT
                - PAYMENT_REQUIRED
                - PAYLOAD_TOO_LARGE
                - UNPROCESSABLE_ENTITY
                - TOO_MANY_REQUESTS
                - INTERNAL_ERROR
                - SERVICE_UNAVAILABLE
            message:
              type: string
  responses:
    Error:
      description: >-
        The request failed. See the HTTP status and structured error code for
        the category.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorEnvelope'
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: Team token
      description: >-
        Pass a Dugble team token in the Authorization header as Bearer <token>.
        Team token secrets use the dgb_team_ prefix.

````