Comment Comment by jamiesonbecker To your second point, AMEX uses 4 digit CVV's[1].However, it's easy to tell the difference between an AMEX and a VISA/MC from the card number alone.1. https://www.cvvnumber.com/ parent jamiesonbecker 10 years ago
However, it's easy to tell the difference between an AMEX and a VISA/MC from the card number alone.
1. https://www.cvvnumber.com/