Here is the list of compatible cards accepted by Hero, organized by country, provided that 3D Secure (3DS) is activated on the card (mandatory):
Austria (AT)
Belgium (BE)
Bulgaria (BG)
Croatia (RH)
Cyprus (CY)
Czech Republic (CZ)
Denmark (DK)
Estonia (EE)
Finland (FI)
France (FR)
Germany (DE)
Greece (GR)
Hungary (HU)
Iceland (IS)
Ireland (IE)
Italy (IT)
Latvia (LV)
Liechtenstein (LI)
Lithuania (LT)
Luxembourg (LU)
Malta (MT)
Monaco (MC)
Netherlands (NL)
Norway (NO)
Poland (PL)
Portugal (PT)
Romania (RO)
Slovakia (SK)
Slovenia (SI)
Spain (ES)
Sweden (SE)
Switzerland (CH)
United Kingdom (GB)