The plugin provides flexibility to define credit percentage on an individual product as well. A store owner can define credit percentage on each product or category individually, and globally. If the Level Base Credit System is enabled, then, it will have an option to add different percentage for each level.
While adding/editing the product, plugin adds another tab named “Referral”. You can open this tab by clicking it. This will result in an option to define global Credit percentage; and, if the Level Base Credit System is enabled, then, it will show all the levels added along with the option to define percentage.