What is CPA Marketing?
CPA stands for Cost Per Action. Unlike other marketing models where an advertiser pays for every surfer seeing their ad (CPM) or clicking on their ad (CPC), an advertiser under the CPA model pays only when a specific action is taken on their website. The advertiser defines this action in advance and only pays when that action is taken. The advertiser action can be as simple as filling out a form on their website or as complex as a multi-page sign-up ending with a purchase through credit card. Generally speaking, the more involved the action, the higher a publisher would expect to be paid for generating it.

I generally work with a few publishers, and will gradually be adding their links once I have verified they pay out on time and are easy to work with.

One CPA network I can verify that pay out on time and have good promotions for world-wide audiences is MaxBounty. They accept users all over the world except China and India.