There is a flaw in Trialpay where a user who really completes an offer can basically give the landing page to someone and that person can fail the offer and then head to the landing page and the offer will complete due to the fact that TrialPay uses a Tracking Pixel.
Tracking Pixels tell the website that your doing the offer for that when you get to the landing page where the pixel is to credit you for the offer.
Users never have to really complete the offer if they can find out where the pixel is at on the landing page.

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