I'm figuring the ways to sell software online. I want a service that is easy to use. PayPal is good, but I'm not sure if most of the people have PayPal. Also Fortumo is a good service, it works in most of the countries, by sending payed SMS. Are there other ways? And what's the most common way?
If PayPal is the best, can someone please provide me a service that uses PayPal to send serial keys from a database. Or something similar.