Usually 16 answer 2 On my card there are the usual 16 on the front face, and the retailers/system pays attention to exp date and spelling of username as well. On the reverse, in the signature panel,...
The number of digits on a credit card varies by the issuer, however, ISO standards for credit cards call for 15 or 16. Visa, Mastercard and Discover cards have 16 digits.American Express cards have...