| Card Type | Card Number Length | CVV Length | CVV Location | Starts With |
|---|---|---|---|---|
| Visa | 16 digits | 3 digits | Back of the card | 4 |
| MasterCard | 16 digits | 3 digits | Back of the card | 51–55, 2221–2720 |
| Amex | 15 digits | 4 digits | Front of the card | 34 or 37 |
| Discover | 16–19 digits | 3 digits | Back of the card | 6011, 65, 622126–622925, 644–649 |