411414 Credit Class and Gift Voucher

Simply..., This will be for a clean first time install of "Credit Class and Gift Voucher/Coupon V5.21 contibution for osCommerce RC2/RC2a" to my website..., I am specifically interested in the % discount section as well as an overide commission based on $ sales targets for individual clients don't know if this is part of the same or a seperate module).