The most common reason a card gets declined isn't a funds issue — it's a mismatch between the billing address you entered and what's on file with your bank. Double-check every field: ZIP code, name spelling, expiration date. If you're shopping on a foreign site, make sure your bank hasn't blocked international transactions by default.
Some merchants don't accept certain card ranges or require 3D Secure verification. If the site keeps rejecting your card details, try a different browser — Safari and Firefox sometimes handle payment forms differently than Chrome. Clearing cookies and cache before retrying fixes this more often than you'd expect.
If the one-time SMS code isn't showing up, first confirm your phone number is current in your bank's app — not with Visa directly, since that part lives on the bank's side. If the number is correct, the delay is usually network congestion. Wait 2–3 minutes before requesting a new code; hitting 'resend' too fast can lock the flow temporarily.
A payment that's been pending for more than 24 hours usually means the authorization was captured but the merchant's system didn't complete the settlement. You can't fix this yourself — contact your card-issuing bank and ask them to check the authorization status. They can release the hold if the merchant hasn't claimed the funds.