Restore Purchase on iOS Devices

iTunes Restore Purchase statement: 

Users restore transactions to maintain access to the content they've already purchased. For example, when they upgrade to a new phone, they don't lose all of the items they purchased on the old phone. Include some mechanism in your app to let the user restore their purchases, such as a Restore Purchases button.

You will not be double charged when you hit Restore Purchase. 

On your Abide app go to Profile > Settings > Restore Purchase