Shipping Calculation

Hi,

Iam using oxid version 4.7.0. I am using a shipping API rate calculator for calculating the shipping cost and so i don’t want to use the shipping calculator at the oxid admin. But i don’t know where I have to add the shipping cost at the front end that to be added with the product cost and shows the grand total. I couldn’t find the calculation. ie the product price calculation based on number of quantities and adding the shipping cost to the products price.

Please help me. Urgent!!!

Thanks in Advance