Skip to content
Featurebase Featurebase Featurebase
Dashboard
API Reference
Users
Companies
Contacts

Attach a contact to a company

POST/v2/companies/{id}/contacts

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

FieldTypeRequiredDescription
contactIdstringYesThe Featurebase internal ID of the contact to attach (MongoDB ObjectId)

Example Request

{
  "contactId": "507f1f77bcf86cd799439012"
}

Response

Returns the updated contact object with the new company association.

Example Response

{
  "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.

Path ParametersExpand Collapse
id: string

The Featurebase internal ID of the company (MongoDB ObjectId)

Header ParametersExpand Collapse
"Featurebase-Version": optional "2026-01-01.nova" or "2025-12-12.clover"
One of the following:
"2026-01-01.nova"
"2025-12-12.clover"
Body ParametersJSONExpand Collapse
contactId: string

The Featurebase internal ID of the contact to attach (MongoDB ObjectId)

Attach a contact to a company

curl https://do.featurebase.app/v2/companies/$ID/contacts \
    -H 'Content-Type: application/json' \
    -H "Authorization: Bearer $FEATUREBASE_API_KEY" \
    -d '{
          "contactId": "507f1f77bcf86cd799439012"
        }'
{
  "id": "676f0f6765bdaa7d7d760f88",
  "name": "John Steezy",
  "object": "contact",
  "type": "customer",
  "commentsCreated": 0,
  "companies": [
    {
      "id": "507f1f77bcf86cd799439011",
      "companyId": "comp_12345",
      "companySize": 250,
      "createdAt": "2025-01-01T12:00:00.000Z",
      "industry": "Technology",
      "lastActivity": "2025-01-15T00:00:00.000Z",
      "linkedUsers": 15,
      "monthlySpend": 5000,
      "name": "Acme Inc",
      "object": "company",
      "plan": "enterprise",
      "updatedAt": "2025-01-10T15:30:00.000Z",
      "website": "https://acme.com",
      "customFields": {
        "location": "bar",
        "priority": "bar"
      }
    }
  ],
  "customFields": {
    "foo": "bar"
  },
  "description": "",
  "email": "john@example.com",
  "lastActivity": "2025-01-03T21:42:30.181Z",
  "locale": "en",
  "manuallyOptedOutFromChangelog": false,
  "organizationId": "5febde12dc56d60012d47db6",
  "postsCreated": 0,
  "profilePicture": "https://fb-usercontent.fra1.cdn.digitaloceanspaces.com/anon_23.png",
  "roles": [
    "string"
  ],
  "subscribedToChangelog": true,
  "userId": "676f0f673dbb299c8a4f3057",
  "verified": true
}
Returns Examples
{
  "id": "676f0f6765bdaa7d7d760f88",
  "name": "John Steezy",
  "object": "contact",
  "type": "customer",
  "commentsCreated": 0,
  "companies": [
    {
      "id": "507f1f77bcf86cd799439011",
      "companyId": "comp_12345",
      "companySize": 250,
      "createdAt": "2025-01-01T12:00:00.000Z",
      "industry": "Technology",
      "lastActivity": "2025-01-15T00:00:00.000Z",
      "linkedUsers": 15,
      "monthlySpend": 5000,
      "name": "Acme Inc",
      "object": "company",
      "plan": "enterprise",
      "updatedAt": "2025-01-10T15:30:00.000Z",
      "website": "https://acme.com",
      "customFields": {
        "location": "bar",
        "priority": "bar"
      }
    }
  ],
  "customFields": {
    "foo": "bar"
  },
  "description": "",
  "email": "john@example.com",
  "lastActivity": "2025-01-03T21:42:30.181Z",
  "locale": "en",
  "manuallyOptedOutFromChangelog": false,
  "organizationId": "5febde12dc56d60012d47db6",
  "postsCreated": 0,
  "profilePicture": "https://fb-usercontent.fra1.cdn.digitaloceanspaces.com/anon_23.png",
  "roles": [
    "string"
  ],
  "subscribedToChangelog": true,
  "userId": "676f0f673dbb299c8a4f3057",
  "verified": true
}