How can you calculate the final price yourself in mopdx minishop2?

Question

MODX

There is a site on modx with a store in minishop2.
You need to add an arbitrary calculation of the delivery cost to the order, there is an algorithm, but it is written crookedly (in the client js) and sometimes it simply does not work.
Tell me, what files should I look into in order to enter the algorithm into the server php, and not the way it is done now?
Maybe there is a link to a specific chapter of some sensible tutorial?
Thank you.

Answer 1

Perhaps this is what you need