Can't read in-app products

Hi, i made a free to play game for android, but you’ll be able to buy the access for premium content. I created the product in google play, asked the authorization for billing, but the node “read in-app purchase” always fails. What can I do?

I did it! In the “config” folder there was no “Android” folder with “AndroidEngine.ini” file. I just copy/pasted the one I found in UnrealMatch3 and everything worked, IAP included.