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First you need to install Episerver Commerce packages and then for different features like AddToCart, ProcessCart etc you can use Service and Repositories that are already created in Quick Silver demo site.
Packages you need to install are
Episerver.Commerce
Episerver.CommerceManager
Other dependent packages will automatically will be installed
I am actually talking about the services and interfaces that are used in Quick Silver demo site.
Do i really need to add those classes and services and interfaces because it is taking too much time.
Those are not nessary part. But to quickly start, those code files will be helpful. So, just include those files that are needed for you. Or you can write your own logic that best suites to you.
I have downloaded the demo project and I want to add e-commerce section in my website.
Should i have to create all the files used for products in that demo project or is there any dlls for it?