In order to ensure user security, the Play Store may monitor certain purchases out of the ordinary. Play Store would cancel purchase in the process if they has determined your purchase was “high-risk”, which can prevent unwanted charges on your device
Don’t worry; the reservation will clear automatically. However, you’ll be unable to make further purchases for 30 minutes (even several days).
Meantime, verify that your name and billing address are exactly as listed on your credit card.
If you continue receiving the “high-risk” pop-up, please contact Google for further assistance.
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Game Guide for Last Empire – War Z