The A1 (Anonymous proxy), AP (Asian Pacific region), EU (Europe) and A2 (Satellite providers) codes refer to IP addresses of which the country of origin is uncertain.
EU, for example, means that the precise IP country is uncertain but it belongs to Europe. Accepting EU as IP address country does not mean you are accepting payments from all countries in Europe, it means you’re accepting payments from IP addresses managed by European institutions.
Anonymous proxies are Internet access providers that allow Internet users to hide their IP address. We recommend that you do not accept payments originating from an anonymous proxy! The question you may want to ask yourself is why would a honest client want to hide his IP address?