Suscription component for another component

I need a component modification or something so handle suscription of the component EXP Autos Pro ([login to view URL]) The developer of that component says that I can use jPayPlans or any other joomla component to integrate to it. I need this because: I need to sell monthly suscriptions to dealers and they will be able to add the amount of vehicles they want to the component. But they need to pay monthly or the plan that I add.