If you encounter any challenges while trying to access the in-game store or while browsing the available items, please don't hesitate to contact us. You can do this by clicking on the "Chat" icon in the upper right corner of the game's Help Center. Feel free to include a screenshot of the issue, which will assist us in identifying and addressing the problem.

For any troubles directly with the purchase, we'd suggest checking the following Google Play FAQ article:
https://support.google.com/googleplay/answer/1267137