# Attach a contact to a company

Attaches a contact (customer) to a company.

Adds the company to the contact's companyIds array and embedded companies array.
This operation is additive - existing company associations are preserved.
Also increments the linkedUsers count on the company.

### Path Parameters

- id - The Featurebase internal ID of the company (MongoDB ObjectId)

### Request Body

| Field | Type | Required | Description |
|-------|------|----------|-------------|
| contactId | string | Yes | The Featurebase internal ID of the contact to attach (MongoDB ObjectId) |

### Example Request

json
{
  "contactId": "507f1f77bcf86cd799439012"
}


### Response

Returns the updated contact object with the new company association.

### Example Response

json
{
  "object": "contact",
  "id": "507f1f77bcf86cd799439012",
  "userId": "usr_12345",
  "email": "john@acme.com",
  "name": "John Doe",
  "type": "customer",
  "companies": [
    {
      "object": "company",
      "id": "507f1f77bcf86cd799439011",
      "companyId": "comp_12345",
      "name": "Acme Inc"
    }
  ]
}


### Error Responses

- 404 Not Found - Company or contact does not exist

### Version Availability

This endpoint is only available in API version 2026-01-01.nova and newer.

Endpoint: POST /v2/companies/{id}/contacts
Version: 2026-01-01.nova
Security: bearerAuth

## Header parameters:

  - `Featurebase-Version` (string)
    API version for this request. Defaults to your organization's configured API version if not specified.
    Example: "2026-01-01.nova"

## Path parameters:

  - `id` (string, required)
    The Featurebase internal ID of the company (MongoDB ObjectId)
    Example: "507f1f77bcf86cd799439011"

## Request fields (application/json):

  - `contactId` (string, required)
    The Featurebase internal ID of the contact to attach (MongoDB ObjectId)
    Example: "507f1f77bcf86cd799439012"

## Response 200 fields (application/json):

  - `object` (string, required)
    Object type identifier
    Enum: "contact"

  - `id` (string, required)
    Unique identifier
    Example: "676f0f6765bdaa7d7d760f88"

  - `userId` (string)
    External user ID from SSO
    Example: "676f0f673dbb299c8a4f3057"

  - `organizationId` (string)
    Organization ID the contact belongs to
    Example: "5febde12dc56d60012d47db6"

  - `companies` (array)
    Companies the contact belongs to
    Example: []

  - `companies.id` (string, required)
    Featurebase internal ID
    Example: "507f1f77bcf86cd799439011"

  - `companies.companyId` (string, required)
    External company ID from your system
    Example: "comp_12345"

  - `companies.name` (string, required)
    Company name
    Example: "Acme Inc"

  - `companies.monthlySpend` (number,null, required)
    Monthly spend
    Example: 5000

  - `companies.industry` (string,null, required)
    Industry
    Example: "Technology"

  - `companies.website` (string,null, required)
    Company website URL
    Example: "https://acme.com"

  - `companies.plan` (string,null, required)
    Plan or tier name
    Example: "enterprise"

  - `companies.linkedUsers` (number,null, required)
    Number of users linked to this company
    Example: 15

  - `companies.companySize` (number,null, required)
    Company employee headcount
    Example: 250

  - `companies.lastActivity` (string,null, required)
    ISO date of last activity
    Example: "2025-01-15T00:00:00.000Z"

  - `companies.customFields` (object)
    Custom field values
    Example: {"location":"Europe","priority":"high"}

  - `companies.createdAt` (string,null, required)
    ISO date when company was created
    Example: "2025-01-01T12:00:00.000Z"

  - `companies.updatedAt` (string,null, required)
    ISO date when company was last updated
    Example: "2025-01-10T15:30:00.000Z"

  - `email` (string,null)
    Contact email
    Example: "john@example.com"

  - `name` (string, required)
    Contact display name
    Example: "John Steezy"

  - `profilePicture` (string,null)
    Profile picture URL
    Example: "https://fb-usercontent.fra1.cdn.digitaloceanspaces.com/anon_23.png"

  - `commentsCreated` (number)
    Number of comments created

  - `postsCreated` (number)
    Number of posts created

  - `lastActivity` (string)
    Last activity ISO timestamp
    Example: "2025-01-03T21:42:30.181Z"

  - `subscribedToChangelog` (boolean)
    Whether subscribed to changelog
    Example: true

  - `manuallyOptedOutFromChangelog` (boolean)
    Whether manually opted out from changelog

  - `roles` (array)
    Contact roles
    Example: []

  - `locale` (string)
    Contact locale
    Example: "en"

  - `verified` (boolean)
    Whether email is verified
    Example: true

  - `type` (string, required)
    Type of contact
    Enum: "customer", "lead"

  - `description` (string)
    Contact description/bio

  - `customFields` (object)
    Custom field values on the contact

## Response 400 fields (application/json):

  - `error` (object, required)

  - `error.type` (string, required)
    The type of error returned
    Enum: "invalid_request_error"

  - `error.code` (string, required)
    Machine-readable error code
    Enum: "invalid_id"

  - `error.message` (string, required)
    Human-readable error message
    Example: "An error occurred"

  - `error.param` (string)
    The parameter that caused the error (if applicable)
    Example: "id"

  - `error.status` (number, required)
    HTTP status code
    Enum: 400

## Response 404 fields (application/json):

  - `error` (object, required)

  - `error.type` (string, required)
    The type of error returned
    Enum: "invalid_request_error"

  - `error.code` (string, required)
    Machine-readable error code
    Enum: "company_not_found", "contact_not_found"

  - `error.message` (string, required)
    Human-readable error message
    Example: "An error occurred"

  - `error.param` (string)
    The parameter that caused the error (if applicable)
    Example: "id"

  - `error.status` (number, required)
    HTTP status code
    Enum: 404