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Doesn't get transmitted right now. Like I said the best thing you typed was you have no idea how it would work...FFS, the marketing data a retailer's POS keeps on file regarding customers and their purchasing history DOES NOT get transmitted to the credit card processing service. The credit card processor doesn't know that you purchased ham, cheese, bread and mustard at the grocery store. The store might know that if you put in your shopper's reward card but all the credit card company knows is that you spent $16.39 at the grocery store.

Just an FYI, my wife spent her career adjusting computer programs for DoD, insurance corporations, HR departments- which are quite a challenge due to all the catagories involved, and a whole slew of Big Box Retailers from Enterprize systems to online retail programs. Creating a program that searches the purchases for firearm sales once the visa card is pushed into the card reader isn't all that difficult. Fraud detection programs can be adapted to search purchases for firearm sales.
Computers are not hamstrung by your limited understanding of programing or computer capabilities...
