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How does the Bank of Communications app check the last three digits of the credit card signature column?
1. First, open the Bank of Communications app on your mobile phone, and log in the account password to enter the main interface.

2. Secondly, in the morning, the APP enters my credit card interface and clicks "Card Manager" to enter the "Credit Card Details" interface.

3. Finally, in the credit card details interface, click "Query Card Number" to find the last three digits of the signature column.