With an international customer base, how do other sites decide what payment options to provide to users?
I've been trying to find the most popular online payment service providers, preferably broken down by country. For instance, which payment service providers process the most transactions, when users in Mexico buy goods online? Ideally, I'd like to find the same data for all countries in North America, South America, and Europe. In the U.S., possible answers might include services such as Paypal, Google Checkout, or Authorize.net.
Any idea where I might be able to find that kind of data? Or is there a better way to decide? Thanks!