My name is Joe Foster and I own an internet marketing company called izudoo Ltd, the company behind cash4testing.com.
I get paid for sending traffic to other companies products and services and they pay me a commission for generating sales. With cash4testing.com I get paid by the companies whose mobile apps I recommend when someone downloads the app and tests it out.
Sometimes the companies involved also pay the customer an incentive for signing up and then other times I pass some of the commission I earn back to the customer in the form of cash.
This is usually a win win situation for everyone involved because I only recommend tried and tested mass market appeal mobile apps that the majority of users will actually go on to use regularly in their daily lives.