BamDingo, a pause function isn't really necessary the way the game is set up. I put a list of the steps I take to secure my game in this post in the VT Forum.

There is a button that shows up on the IAP pop up that says "Restore Purchases". If I understand this correctly, that restores previous IAP purchases to a new game on that device. I hope the mods will correct me if I am wrong here.