People clicks on IAP buttons, but do not complete purchase. What to do ?

Hello,

In my game, I have a in-app shop. Lots of people opens the shop then clicks on the purchase button, but do not complete the purchase. Sometime, I can see purchase complete in my analytics tool, but I can’t see complete purchase in developer console.

What should I do to increase my IAP sales & stop people who is hacking the IAP ?

Thanks.

Did u check Ur Google wallet

Yes. I have already checked them. But it shows nothing.