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When entering credit card or debit card information, it is advisable to enter all information in
ALL CAPS, as if WITH THE CAPS-LOCK LIGHT 'ON', ON THE KEYBOARD. This is because the information you enter must match what the bank has stored in its computers. And often, for backward compatibility with the very earliest credit systems, your information is stored in ALL CAPS.
Also make sure the information you enter, e.g. as to your address, has it entered exactly as it appears on your credit or bank statements.