Google Purchase Cancelled
When purchasing in-game currency through Google Play, purchases may occasionally be cancelled by Google, and an authorization hold may show for the failed purchase. Authorization holds show as "pending" transactions, and will disappear without actually posting to the account, usually within 2-3 business days.

When this happens, Google recommends waiting at least 24 hours before you place a new order so that any temporary issues can be resolved. In the meantime, please ensure your payment information is up to date and sufficient funds are available for your purchase.

To update your payment information, sign in to your Google Play account at:

https://play.google.com and click Edit payment methods.

If you have reviewed your Google Play account and believe that everything is up to date and there is no reason for such an error, you may contact Google directly by using the following link:

http://support.google.com/googleplay/bin/request.py?contact_type=contact_policy&policy=apps