Most card failures come from the bank, not from Legend. Try these fixes.

Reason	What to do
Your bank blocks crypto payments	Call your bank and ask it to allow the payment, or use a different card
The billing address or ZIP code is wrong	Enter the address that your bank has for the card
The card is a prepaid or virtual card	Use a Visa or Mastercard debit or credit card
The amount is outside the limit	Card: $25 minimum. Apple Pay and Google Pay: $25–$500
Your location is not supported	Use crypto. Apple Pay and Google Pay are US only
Your bank asked for authentication and it timed out	Try again and approve the payment in your banking app

If a payment failed but your bank shows a charge, read My bank charged me, but the deposit did not arrive.