I am doing a module that has different steps before the checkout and in one of the screens i need to save a value to add in the order.
I don't have any trouble to get the value and sending via ajax to the controller but i am not sure the best way to keep this value and get it after the client refresh the page select the product and goes to the checkout.
Not sure if it is better to use e session, cookie or save in a custom table with some kind of session id ?