Brand the door, keep the keys
White-label means the login, the domain, and the messages show the agency or the client brand you agreed on. It does not mean you delete your own access. Support is impossible from outside the account.
Decide, in writing, who is the admin and who is a user. The person who can break the snapshot should be a short list.
Do not brand it before it sends
A beautiful login on a domain that is not pointed, or a form that still sends from a default address, is worse than a plain account that works. Finish the domain and the sender, then change the name on the door.
Check the branded link in a private window. If the platform name still appears on the login or the email, it is not white-labeled yet.
Updates have to be possible
A client account that cannot receive a later snapshot fix becomes a one-time project. Keep a note of what was customized after the copy, so an update does not wipe the thing they asked you to change.
That note is the difference between a brand you can stand behind and a logo on a system you can no longer touch.
