Accepting cards from most locations isn&#x27;t actually difficult any longer with Stripe, Braintree, Paymill, and others. US cards aren&#x27;t special in terms of being able to accept them; they&#x27;re just regular Visa&#x2F;MC&#x2F;Amex&#x2F;Discover&#x2F;whatever cards.<p>The neglected payment methods are the country specific ones. Some major countries have very low credit-card penetration, for example in the Netherlands. The common internet payment method there is iDEAL which is a kind of two factor authenticated bank transfer. Even debit cards in the Netherlands have two distinguishing features: there isn&#x27;t a PAN number on the card which makes it impossible[0] to use online in the way you&#x27;d use an embossed Visa&#x2F;MasterCard, and the Dutch banks all issue their debit cards under the Maestro and V-Pay schemes.<p>[0] Not really, but very few people know what their debit card&#x27;s PAN number is. It&#x27;s possible to calculate the hidden PAN number as it&#x27;s usually just a regular Maestro card, or to just scan it off the card using NFC and an appropriate app.