The best way is to get one done custom to what you need it to do. That way you are shown exactly how to use it, and you dont get anything more than you need/want; saves on confusion.
I've made a few of these before. Once, a DJ handed out business cards with automatically generated PINs. When the clubber went to the site on the card and entered the PIN, it gave the user "x" number of credits, which could be used towards merchandise.
Lemme know if you need my help, Mr. Younge.
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