For integration tests of an e-commerce checkout process that includes the credit card payment gateway of a third party, I would like to acquire prepaid credit cards. Especially for fraud-prevention it's very hard to test the full process inclusively without having real cards.
I am located in Germany, where it's possible to buy these kinds of cards that come with a pre-charged amount of money (typically something like 25, 50, 100 Euros) in gas stations and small stores that also sell top-up mobile phone credit. These cards work well, but are not helpful for testing processes that include issuer-country fraud-prevention methods at the 3rd party.
I know that in the US there are gift Visa cards such as the Walmart Visa Gift Card, but it says they only work in the US, and not on the Internet.
Finding working cards seems to be pretty hard and the only idea I've had so far is asking friends in other countries or colleagues who go on vacation to look out for this type of card.
They should exist in a lot of countries, as long as credit card is a broadly accepted payment method there, and there are parts of the population who might not have a good credit history, as paying cash for a one-time credit card number eliminates that factor and enables them to buy stuff online.
I am looking for solutions of either how to acquire one of those cards from a country other than Germany, or alternative methods to integration test my checkout.