$this->config->get() - how does it work?

Hi.
I'm new to the PHP MVC concept and i'm trying to understand how does the OpenCart platform work.
My question is how does the config object method "get()" obtains data from the "setting" table.
For example, "$this->config->get('g2apay_order_status_id');" - where is the "g2apay_order_status_id" variable value located?
Thank you and sorry for my noob question.

.......is a value that is stored in the settings table. Your questions was how does it obtain it? It is through a Select Query, just like all data coming from a database. Brush up on your php and mysql.

I know that...if it wasn't clear, i was asking how's the object and its fields & methods build, but i found out (index.php - lines 48 @ 56 - opencart v2.1.0.1 & the methods - system\library\config.php).
thanks anyway

Glad you cleared that up, and found your answer.