The Google Play Store maximizes customer security with the help of a function that keeps an eye on your shopping behavior. If you try to buy something that seems out of the ordinary, the Play Store may give you a _high risk_ warning and cancel the order.
Please rest assured that this has nothing to do with the security of Age of Warring Empire or the Play Store_s services. It is simply an added layer of security to prevent sizable unauthorized or unintentional purchases from being made. Meanwhile, it is possible that the Google Play Store has put a temporary _reservation_ on your credit card, equal to the value of the purchase you tried to make, but this reservation will clear automatically.
Unfortunately, you will not be able to buy Gold Coins again immediately. The pop-up asks you to wait 30 minutes, but sometimes you might need to wait a little longer. You might also want to double check that your billing address and your name registered in your Google Wallet are spelled exactly the same as the ones your credit card issuer has on file.
If you still keep getting the _high risk_ pop-up when you try to buy Gold Coins, please contact Google via
https://support.google.com/googleplay/digital-content/?hl=en for further assistance.
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Game Guide for Age Of Warring Empire