At some gas stations, docerias, and many resuraunts, Brazilians use a pretty innovative system for paying for things. When you enter the resuraunt or shop, you are given a bar-code tag. When you order food, drinks, deserts, the item or items are scanned onto your tag. When you're done and you're ready to check out, you bring the tag to the cashier and pay. This is system is most commonly used in places where you order from behind the counter, when you might come back several times for different things.
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