Enter the starting number that is used to identify and verify the card type in the system. This number can be a single digit ...

Enter the starting number that is used to identify and verify the card type in the system. This number can be a single digit if, for example, card numbers for the card type always start with the number 4. If the card type is identified by the first four digits in a specific range of numbers, this field specifies the start of the number range.
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