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A strident beep would be useful in case of "declined transaction"
Set a different ringer (and a strident one) when a transaction is declined: to alert the employee who is processing the transaction and avoid for that transaction to pass unnoticed. it has happened in my salon: the screens sequence did not make it clear that a transaction was refused, and no beep came on to make it conspicuous.We got defrauded without being alerted!
10 votes
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