Does RevCat make "Receipt Purchase validation" in their server side?

My question is simple. Since use server-less database, I don’t want to learn some other language and create my server side validation to prevent fake purchases with jailbroken phones. Even I create a server side validation, there are bunch of apps that they can directly access to “.success” method while purchasing and give the game tickets to the scammer. So I need to learn If I change it my all apps to RevenueCat, do you handle the validation & verification of the “real purchases” or should I go with learning server side.