Incorrect card type selection: The customer selected a different card type (e.g., debit, credit, prepaid) than the one corresponding to the card number provided.
Typographical errors: Mistakes in entering the card number can lead to validation mismatches.
Outdated or incorrect saved card information: Saved payment methods may have outdated or incorrect card type information.
Inform the customer that there was a mismatch between the selected card type and the entered card number.
Ask the customer to:
Recheck their card number.
Ensure they select the correct card type that matches the card they are using.
Clear any saved incorrect card details if applicable and prompt the customer to re-enter their payment information.
Retry the transaction only after confirming that the correct card type and number have been selected.