I had the same confusion - it only asks for the code several steps in.
I bought £180 of books for £90 when drunk, and I don't know if I should be ashamed for the spontaneous splurge, or proud of the great savings.
Reminds me of the classic 50s New Yorker cartoon of the housewife coming home with an armful of parcels saying "guess how much I saved in the sales today"