How to get information about goods in the shopping cart on Bitrix?

Question

1C-Bitrix

Good day everyone!
We purchased the solution https://marketplace.1c-bitrix.ru/solutions/concept... . With the help of which the online store is made. Later, I received the task of connecting a payment button on credit from one of the banks. By regular means of Bitrix, such a button cannot be connected. There are no problems with the connection itself in the DOM tree of the shopping cart. The button is connected and everything works.
The question is as follows. How can I track which items have been added to the cart? And then add them to the options for obtaining a loan.