Hi Andreas,
I have bought 3 templates from you (Admob + IAP, IAP Store Base and Slide In Menus).
You did really an amazing job with those templates and they deserved every single euro I gave to buy them, they really helped me very much.
I managed to make the ads work on the ALPHA release of my game.
However i can not get my in-app purchases to work in my ALPHA release on google play. I followed your tutorial and studied carefully your CapX but it doesn't work for me.
The Store Listing and Items Fetch is successful, but when my testing accounts try to make an in-app purchase, we are getting the following message "Error - Authentication is required. You need to sign into your Google Account". I have tried a lot of things to solve this but nothing works.
What can I do to solve this and why are we getting this error message?