numbers of credit cards

4 = Visa. credit cards low apr 3 = American Express The following five digits refer to the specific issuing bank It is with these numbers that the necessary exchange of information for every transaction can take place Mastercard: 2 and 3; 2 to 4; 5; or 6 Visa: 2 to 6 American Express: 3 and 4 (indicating whether the card is Platinum, Delta, etc )