By October 1, you'll be expected to have upgraded your card terminals to accept so-called EMV cards--short for Europay, MasterCard, and Visa. These are the most advanced generation of credit cards, equipped with small microprocessors that secure point-of-sale transactions by encrypting the personal information of the cardholder.
If you haven't upgraded to newer machines, generally speaking you'll be on the hook for any fraud that happens with these cards after the deadline. Take a breather, though. The implementation won't happen overnight.
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