QR Codes and UPC codes

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r_khan

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Joined
Aug 18, 2003
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376
hello,

I am a small business owner that wants to incorporate gift certificates.

However, i have a problem; i know how to make the gift certificate (via a template), the amount (it will be pre-printed with $5-$25, in increments of $5), generate a UPC code and a QR Code...

BUT

How do i ensure that the QR Code and the UPC is redeemed ONLY ONCE?

For example, I want the qr code and the upc to have a "one time use only"

How do i do that?
 
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