When you use a “debit” card your financial institution puts a pre authorization hold on your account then later they release back to your account what you didn’t use. Also a machine can only accept 1 transaction at a time. Ince you swipe you have to press “start” and the machine has to complete cycle before it can accept another transaction. You can swipe your card 20 times but if the authorization is not accepted by your bank AND the “start” button does not light up then there is no transaction.
Monday morning the management should be in the morning cleaning he can help you out
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