woo commrece wallet system customization

I need some changes to an existing website. i have a MLM website in woo commerce i have used this plugin [login to view URL] Now what i need is, there have wallet option in this plugin. when user A refer user B then A will get commission $5 and B get $5 in this plugin they can use thier commission on checkout but they need to convert thier commission in coupon, after cover they get coupon code, when they apply coupon code they got discount on final amount. what i need in this if User A hsve $5 in his wallet during checkout he can only use 10% of final amount example User A final cost is $43, he have $5 in his account, so he have get $4.3 (10% of final amount) If final amount is $60 and he have $5 in his wallet he can get $5 discount.