API to add users in the draft list by passing its version_id returned in Start Sync API response.
Pass as Bearer <API_KEY>. Get API Key from SuprSend dashboard Developers -> API Keys section.
Unique string identifier of the list to which user needs to be updated
Unique string identifier of the draft version of the list to which user needs to be updated
Array of subscriber_ids, uniquely identifying the subscribers to be added to the list.