Edit prices on checkout

[cocahim]

I'm not a Prestashop expert but a customer asked me if there is a way to change the price of individual products during checkout (he has a private ecommerce reserved only for his resellers so all the thing would be under control). I wanted to ask someone more experienced then me if this is at least feasible, if Prestashop (1.7) allows such a change; I tried to search for good among the modules on the store but I did not find any. Thank you.