If you're having trouble accessing the in-game store or browsing the items there, be sure to reach us via in-game Help Center with the screenshot of the issue so we could check what went wrong.
For any troubles directly with the purchase, we'd suggest checking the following Google Play FAQ article: https://support.google.com/googleplay/answer/1267137?hl=en
Unable to make a purchase (Android)
Last Updated: 366d