Does anyone know where I can get some high quality step by step info on creating a full shopping cart for an asp.net mvc 5 ecommerce application? I have seen examples out there but none of them talk about how to add working payment methods and creating a secure checkout. I want to build something like shopify checkout that is secure and simple. I just keep finding examples on everything BEFORE you reach checkout, like sessions and user adding to cart and seeing the view cart etc...
I have read the book Professional ASP.NET MVC 5 by Jon Galloway where he has the example of the MVC Music store, but nothing about how to actually process payments and all that. I know checkout has to also meet a bunch of requirements required by the processor and the gateway (don't wanna get hacked and sued or anything).. How do I even start / approach a project like this?
Can someone help push me in the right direction?