Want to get cart items total Price

I have developed a new Payment Plugin named credit. The plugin is for: a customer can have credit in his/her account and he can also select payment method as Pay with your credit. Now How can I access the cart items total price to compare with the Customer credit or minus from the customer credit. I am using Nop 4.0.


Help in this regard will be really appreciated.

Pls do not create duplicate post for same question.