Hello, We have a website where we are giving away free samples of our product in order to let them try our product. As we are only resellers and not the content's owners, every sample cost us a little (0.03$). Our users are willing to spend from 10 to 30 minutes in our website completing tasks like a survey, a phone subscription service (I'd prefer to avoid this one as it won't look nice in our business), etc. So the main idea is that before they received their free sample, they will be cashing us some money, for example from every survey an advertising or referral company would pay us for this actions completed (like a PTC). My main question is what kind of trustable platforms or companies do you know that would do this scheme and would pay well. Thanks in advance!