There’s a whole console behind the counter — not a listing page. Read a case of cards from a photograph, answer the offers that come in, keep every collector who ever bought from you within a handle’s reach.
Photograph the counter and the multi-card scan reads every slab in the frame — no evening lost to data entry.
The same offer loop collectors use, at shop scale: counter, accept, done, with a record of who sent what.
Everyone who ever bought from you stays reachable by handle — the reason quests finish is the shop that had the card.
Setting up isn’t the dealer agreement. The agreement is a separate step you read once you’re signed in, and it starts only if Quest accepts and tells you so.