Sorry if this has been covered elsewhere. Searching for "clear" yields quite a few pages of results, and I'm not sure where the proper forum is to ask this. With the new Amex Clear benefit, I wanted to register with them to go ahead and get the vaccine passport even though I don't have any flights coming up.

Does anyone know if I can just walk into a terminal with Clear, register w/o having a ticket, and waltz out of there verified and ready to go?

Thanks!