Code 10
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Code 10 calls are made when merchants are suspicious about accepting a credit card. The phrase "Code 10 authorization" is used to avoid alerting the customer to the fact that the merchant is suspicious of their card.
The operator then asks the merchant a series of YES or NO questions to find out whether the merchant is suspicious of the card or the cardholder. The merchant may be asked to retain the card if it is safe to do so.
