Back in the days, when you use a credit card to pay for something, the merchant will usually give you a carbon-paper packet. This is because the credit card company needs to have a copy of your receipt to process the transaction. The carbon-paper packet is placed between your credit card and the receipt, so that when you sign the receipt, your signature is also transferred onto the carbon copy. The payment process is made with a zip-zap machine and tight-fitting slide running over both card and carbon-paper packet.
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