Go to your inspection grid by clicking on Inspections -- View Inspections. Choose your desired inspection and click on Actions -- Payment Information. (Or click on the $ icon if you have icon view enabled)
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In the Payment interface, scroll down to the Payment History section and click on the Void option:

If you have any questions about this process please let us know! You can reach us by chat, email at help@inspectionsupport.com, or phone at (800) 700-8112.