CVC (Card Verification Code) and CVV (Card Verification Value) are two names for the same thing — the 3-digit security code on the back of your card. The payment form (hosted by Stripe) uses "CVC" because it's the ISO payment-industry standard term.
What each brand calls it
- Visa → CVV (Card Verification Value) — 3 digits on the back
- Mastercard → CVC (Card Verification Code) — 3 digits on the back
- American Express → CID (Card Identification Number) — 4 digits on the FRONT, above the card number
- Discover → CVD (Card Verification Data) — 3 digits on the back
Amex users: your code is 4 digits and it's on the front of the card, not the back. The Stripe form still calls it "CVC" but Amex cards work fine — just enter your 4-digit front code.
This is not a bug in FocusDragon. We use Stripe's hosted checkout which uses "CVC" universally. Every card type is accepted.