I have just made some testing with several VPNs / VPS in which country which payment options for buying premium are available and here is my result:
North America
Canada: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Panama: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
USA: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Europe
Austria: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Croatia: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Cyprus: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Czech Republic: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Denmark: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Estonia: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Finland: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
France: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Germany: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Greece: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Hungary: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Ireland: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Lativa: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Lithuania: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
Luxembourg: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Moldova: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
Netherlands: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
Norway: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Poland: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Portugal: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Spain: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Russia: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
Ukraine: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
United Kingdom: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Australia
Australia: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
South America
Argentinia: Visa, MasterCard, Amex, Bank Transfer/iDeal, Paysafecard, Webmoney
Brasil: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
Asia
Hong Kong: Visa, MasterCard, Amex, Bank Transfer/iDeal, AliPay, Webmoney
India: Visa, Bank Transfer/iDeal, Webmoney - NO MasterCard and NO Amex
Indonesia: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
Iraq: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
Japan: Visa, MasterCard, Amex, Bank Transfer/iDeal, AliPay, Webmoney
Jordan: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
Malaysia: Visa, MasterCard, Amex, Bank Transfer/iDeal, AliPay, Webmoney
Pakistan: Bank Transfer/iDeal, Webmoney - No CC at all, not even AliPay!
Philippines: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
Singapore: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
Vietnam: Bank Transfer/iDeal, AliPay, Webmoney - No CC at all!
Africa
Egypt: Visa, MasterCard, Amex, Bank Transfer/iDeal, Webmoney
So in general you can see there are only very few tested countries (from my tested country list it's India and Vietnam) where there is a problem with credit card payments. What I observed is that AliPay does not work at all even if it shows up, it fails with an error message from Adyen before getting even to AliPay itself.