Have you ever played a game on your mobile device like Contract Killer or Tap Fish and were in need of more “credits?” Sometimes you could earn them by completing a mission or just waiting till the next day. But what if you couldn’t? What if you were willing to actually pay for in-game credits to improve your score? Recently, Google allowed in-app payments for Android that gave a gamer the chance to buy a gun, more money, or anything that increased their odds of winning. Honestly, I found myself doing this with Glu’s Contract Killer. But who facilitates this process? Tapjoy does.