Emv About limit in the aid - chuwuwang/ReadingNote GitHub Wiki

9F1B

Terminal floor limit, 4 bytes.

This parameter that is mainly used in the first step of the risk management terminal - the minimum limit check.

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9F7B

Terminal offline floor limit, 6 bytes.

When the transaction amount is less than 9F7B, the terminal can execute offline transactions.

In UPI pboc electronic cash, it is called terminal electronic cash transaction limit. When the transaction amount is less than 9F7B, the terminal can perform electronic cash offline transactions.

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DF19

Terminal contactless offline floor limit, 6 bytes.

Above that limit, need to request online.

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DF20

Terminal contactless floor limit, 6 bytes.

Above that limit, the transaction is declined, prompting the cardholder to transaction in another way.

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DF21

Terminal contactless CVM limit, 6 bytes.

Above this limit, the terminal should place CVM Required in transaction attribute 9F66, which tells the card terminal that CVM is required at the GPO.

UPI pboc's cardholder verification is only available for signature and online.

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With respect to card balances, when the transaction amount is greater than the card balance, but does not satisfy any of the above transaction rejections, the terminal will choose to go offline to online.

Of course, if the transaction amount does not exceed the card balance, but is greater than DF20, the terminal rejects the transaction.