WP Simple Pay and Stripe support over 30 locales and 135+ currencies.
All forms are in Test Mode, and no live payments will be processed. Test using card number 4242 4242 4242 4242, any future expiration, any CVC, and a US-formatted post code (such as 42424). More test numbers here.
French Locale + Euro Currency
Display the credit card field localized for French, and collect payments in euro.