I usually avoid accepting share from business success because it always includes free work from my side.
However, after years being in the business, I found a client who is ready to offer business profit share ABOVE our regular costs. Like incentive to put even more of myself in the project and to easily drop any side offer on new products.
The app is a mobile app and generates income via in-app purchasing and ads. So how do I get X percents of the profit? How do I know the amount of profit on monthly/yearly basis?
The client is very serious and the question is serious. How can I assure that I actually get X percent and not less?
I am not a petty person, but if I am offered something, I do not like to be screwed, but I expect transparency. So I am asking this questions in advance just to be prepared if something bad happens to know how to react.
EDIT: Signing a contract (just that) is not an option because each contract violations request me to go to court which take a lot of time and additional costs. So I am looking for practical and concrete solutions aside of the legal ones provided by a contract.