The LUHN formula can be used by a business to make sure a credit card is valid before sending the number for debit authorization.
LUHN公式可以由业务使用，以确保信用卡发送借记卡的号码授权之前是有效的。
The LUHN formula can be used by a business to make sure a credit card is valid before sending the number for debit authorization.
LUHN公式可以由业务使用，以确保信用卡发送借记卡的号码授权之前是有效的。
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