Here are the instructions to register the purchase:
1. Log into the app if you have created a account, else create a account or login with facebook.
2. Tap on " TAP TO EARN " button on the "Rewards" Screen.
3. Select the location of the receipt from the list appeared.
(make sure your GPS is switched on )
4. Your Phone's camera app will get open, scan the BAR CODE on the receipt or click the picture of the receipt (As applicable on Location).
It will be then verified by the system in next few hours for the punch and on successful verification punch will be credited in the account.