You can use this request to create many contacts at once by passing an array of contacts to the server. Each contact’s details should be indexed by a separate array key. You can only create up to 2,000 contacts at once this way.
The API will return a 201 Created HTTP response if all contacts were created successfully. If some of the contacts failed, a 200 successful request response is returned, which contains information about each contact. For contacts that were not successfully created, details of the error will be returned for that specific contact.