Write.
hello@flagholm.com
Say the change, the few people who should see it, the number you will watch, and the person who may turn it off. A paragraph is enough.
If you do not have the number yet, do not ask for the flag. That is the gift note. It stays off until the number has a name.
We do not keep a public rate card. Ask, and we will say what it costs to keep the flags you actually mean to own.
We are the same people on X. The mail is the better place for a real note.