Your sale does not go through until the buyer's payment is confirmed. They don't need to confirm that they recieved the ticket(s). Only the seller needs to confirm a transfer on StubHub or upload the ticket to StubHub. Sellers get paid even if the buyer never downloads the ticket or accepts the transfer or even if they never use the ticket. But a seller won't get paid if they don't confirm the transfer on StubHub, even if the buyer does accept it. Good luck.