Have a valid credit card.

有一个有效的信用卡。

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Please enter a valid credit card number.

请输入正确的信用卡号码。

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Process a payment transaction if the credit card is valid.

如果信用卡有效，处理付款事务。

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A credit card is not a valid proof of identity.

卡不是有效的身份证明文件。

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A credit card is not a valid proof of identity.

卡不是有效的身份证明文件。

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