Where are the files that sends to the OpenCart admin database?

Question

PHP

Good evening developers!
There was such a question, which file in OPENCART is responsible for sending the order to the admin panel database ..
That is, in detail:
When a user adds some product to the basket and makes a purchase ...
All this appears in the admin panel, in orders.
The result, which file is responsible for sending the order to the database - to orders in the admin panel

Answer 1

The files that are used are specified in the address bar, parameter route=folder/file/method.
In this situation, one file is placed in the basket, and another one is selected in the admin panel.

Answer 2

cart.php

Answer 3

OpenCart uses MVC, it follows that all database manipulations occur in models, look in the controller which method, which model is called when the order passes.