Create a contact

POST/api/v1/contacts

POST /contacts

curl -X POST 'https://www.unitpost.com/api/v1/contacts' \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -H 'User-Agent: my-app/1.0' \
  -H 'Content-Type: application/json' \
  -d '{
    "email": "customer@example.com",
    "first_name": "Ada",
    "last_name": "Lovelace"
  }'

Response · 201

{
  "object": "contact",
  "id": "id_123",
  "email": "customer@example.com",
  "first_name": "string",
  "last_name": "string",
  "unsubscribed": false,
  "unsubscribed_at": "2026-01-01T00:00:00.000Z",
  "unsubscribe_reason": "USER",
  "custom_fields": {},
  "created_at": "2026-01-01T00:00:00.000Z",
  "updated_at": "2026-01-01T00:00:00.000Z"
}

Add a single contact to your workspace. Set an email plus any standard or custom field values; custom fields must already exist (define them with Create a custom contact field). Emails are unique per workspace, so creating one that already exists returns 409 — use Update a contact to change an existing contact, or Start an async contact import to add many at once. Requires the contacts:write capability.

Request body5 fields

Field	Type	Description
`email`required	string	—
`first_name`	string	—
`last_name`	string	—
`unsubscribed`	boolean	—
`custom_fields`	object	—

Response · 201 fields11 fields

Field	Type	Description
`object`required	string	—
`id`required	string	—
`email`required	object	—
`first_name`required	object	—
`last_name`required	object	—
`unsubscribed`required	boolean	—
`unsubscribed_at`required	object	—
`unsubscribe_reason`required	object	—
`custom_fields`required	object	—
`created_at`required	string	—
`updated_at`required	string	—

201401409422

Create a contact

Create a contact

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