I need to be able to calculate the value and lifetime value of a client. This means that if I buy a service to a vendor and then sell it to customers, then I need the price of this to be splitted on the customers. Since I sold them a service, I need to see the margin I made. By doing that for everything I should be able to calculate the value of my customer. Is there a way to do this or if not how to make the necessary exports ? And what should i be careful about ?