If you have a code to redeem for a Mindifi app In App Purchase on Android, start by making sure you are logged into the Google account you used to originally purchase the app. Once you’ve logged into the correct Play Store account, tap the specific purchase you are trying to redeem as if you were going to purchase it.
Instead of tapping “Buy Now” in the purchase window, tap the drop down arrow next to the saved credit card.
You will now see the option to select Redeem, tap it.
Type in your code in the given text field. Tap Redeem and you’ll be able to download purchase. Enjoy!