Add an In-App store to your game. Sell items like potions, swords, new levels, new monsters... anything, it's your game, you decide!
The plugin comes with a Demo scene that includes a simple working store.
Here is a tutorial video to help you get started.
Here is the included ReadMe.
Please note that to keep that price of the plugin at a minimum there will be email support only and a full refund will have to suffice in some circumstances. You also need at least some coding experience in C# to make full use of the plugin. By purchasing the plugin you show that you accept these statements.