Support International Payments in AppExchange Checkout | ISVforce Guide

Verify AppExchange Checkout Is Supported in Your Country
To accept payments with Checkout, your company must be based in a country that's supported by our payment partner, Stripe.

Collect VAT for AppExchange Checkout Transactions
If your country's tax authority requires you to collect Value-Added Tax (VAT), you can include VAT in Checkout transactions. After you enable this option, VAT is applied to invoices in Stripe. You’re responsible for VAT registration, maintaining required data, and distributing the taxes that you collect.

Strong Customer Authentication for AppExchange Checkout
Strong customer authentication (SCA) enhances the security of online payments with an identity verification step. Learn how SCA works, which regions require it, and how it affects Checkout payments. Then get your company and customers ready for SCA.