Code location of % received from successful projects

Hey, I was wanting to add some conditional statements to add additional features to the payment system, specifically the % of money you keep from each project. I know in the WordPress admin section you can set the percentage of how much you want to take from each successful project but I’d like to add features to that if the user has multiple projects on my site. I can’t seem to find the code location for where it grabs the % value etc. any help would be greatly appreciated!