I have a client that has a group buying site (like Groupon and LivingSocial) and he wants to each coupon purchased to have some sort of unique identifier (auto gen number, bar code, or QR code) that can then be read by the merchant via a smartphone and validated via the database.
He wants to make sure that people can’t duplicate the coupons they buy.
Event Espresso has something similar to this for events, but not for just coupons on non-event type items.
Any suggestions on either a plugin that would handle this or how I can program in PHP or JS to generate a QR Code for each coupon sold and then validate it via a QR code reader?
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