Yes — you can pay for a Cambodia eVisa with American Express. The checkout takes Amex alongside Visa, Mastercard, and Discover for the $80 all-in Tourist or $90 Business price, billed in US dollars. Here is exactly how Amex behaves at checkout, when to reach for a Visa or Mastercard instead, and how to clear a decline in under a minute.

Yes. The Cambodia eVisa checkout accepts American Express for US citizens, right alongside Visa, Mastercard, and Discover. You pay the $80 USD all-in Tourist eVisa or $90 USD Business eVisa price on your Amex card, billed in US dollars, with no separate processing surcharge added at the final step. If your Amex ever declines — almost always your own issuer flagging an unfamiliar international charge, not the card being unsupported — a Visa or Mastercard fallback is one tap away on the same checkout screen. A quick heads-up to Amex before you apply clears nearly every decline in advance. The charge settles in US dollars, so there is nothing to convert, though some Amex cards still add a foreign-transaction fee of roughly 2.7 percent, which is the issuer charging you, not the visa price.
This guide covers how Amex behaves at the eVisa checkout, why it is often the smart card to use for a travel charge, the one fee your own issuer might add, the Visa and Mastercard fallback if Amex ever balks, and the 30-second move that clears almost every decline before it happens. If you just want the full rundown of every option, our Cambodia eVisa payment methods guide for Americans lays out every card and wallet side by side. When you are ready, you can apply and pay on whichever card you prefer.
A personal Amex and a business Amex are processed identically at the eVisa checkout. If you are traveling on a Business eVisa and want to put the $90 charge on a corporate Amex for expense purposes, that works the same as a personal card — the checkout does not distinguish, and the receipt that lands in your inbox is itemized cleanly for a reimbursement claim. If you are weighing which visa type you actually need before you pay, our guide on the documents required for the Cambodia eVisa walks through the tourist-versus-business decision.

The one caveat that applies to Amex as much as any card: foreign-transaction fees. Even though the visa charge is billed in US dollars, a card without a no-foreign-transaction-fee policy can still tack on a percentage because the merchant settles outside the US. Amex travel cards like the Platinum and Gold waive that fee; some no-annual-fee Amex cards do not. If you carry more than one card, our guide to the
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A debit card with a Visa or Mastercard logo also works as a fallback, processed exactly like a credit card as long as it is cleared for international online purchases. So does paying with PayPal, Apple Pay, or Google Pay if you would rather not hand-key a card number at all. The point is that acceptance is never the blocker. If you do hit a stubborn decline, our walkthrough on fixing a declined card for the Cambodia visa runs through every cause and the fix for each, in order.

If none of that resolves it, switch to a Visa, Mastercard, or one of the wallets and keep moving — there is no penalty for changing payment methods mid-checkout, and you will not lose your application data. For the full decline playbook with every cause ranked by how often it actually happens, see our guide to fixing a declined card.

Next steps and related reading for US travelers: apply for your Cambodia eVisa when you are ready to pay, compare every option in our payment methods guide for Americans, check whether your card adds a foreign-transaction fee, and bookmark our Cambodia visa hub for United States citizens as the single canonical reference for cost, documents, and processing.