What happens when you pay by debit card in shops?

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example if went tesco , bought £46.14 worth of shopping , paid on card. happens next? there big bank account belongs tesco , taken out of bank account , put theirs? done in air? how businesses make profit on surely banks charge them too? it's fascinating me. can't comprehend fact inserting card machine , typing in pin, money transferred somewhere else. can help?

an example if went tesco , bought £46.14 worth of shopping , paid on card. happens next? there big bank account belongs tesco , taken out of bank account , put theirs? done in air? how businesses make profit on surely banks are...


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