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What do the last three digits on the back of China Merchants Sunflower Bank Card mean?

These three digits are the CVV/CVC code, commonly known as the last three digits. It is a set of check codes printed on your credit card, usually 3 or 4 digits. It is a universal security code to verify the authenticity of the credit card, thereby preventing credit card theft or fraud, usually during offline transactions. Use, now online payment basically requires entering these last three digits.