The new endpoint returns any new provider hotels added to your account along with its channel ids.
The Updated endpoint returns all the existing provider hotels on which the channel ids are either added or removed.
The Deleted endpoint returns any provider hotels which are removed from your account. You won’t receive any channel ids in the deleted API. If you do, you can ignore them since the whole provider hotel is being removed. So, the removal or addition of any channel id from any provider hotels is taken care of by the updated endpoint.