What's the deal with these Chick-fil-a codes? How is it done?

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Hey guys,

Ive seen  a few people selling chick-fil-a codes for about a dollar each in various places. Im genuinely curious how they are getting them and how it is done? I dont believe the codes are being cracked but I could be wrong. Is there a method or something? Drop a reply.

Thanks,
FunkMasterFlex