Update contact list subscription status

Updates the subscription status of a contact in a specific list. Can set status to active, pending, unsubscribed, bounced, or complained.

Note: This endpoint only modifies existing list memberships. It does not add a contact to a list. To add a contact to a list, use the /subscribe endpoint (for public lists) or the /api/contacts.import endpoint (for any list, requires authentication).

{
  "workspace_id": "ws_1234567890",
  "email": "user@example.com",
  "list_id": "newsletter",
  "status": "active"
}

{
  "success": true,
  "message": "status updated successfully",
  "found": true
}