Question: Is it the paypal API compatible with asp.net MVC? 
Does anyone know of any expamples of how to implement it?
Thank you.

Answer: 
yes it is compatible.

Have a look at [MVC Storefront Starter Kit](http://www.asp.net/mvc/videos/mvc-1/aspnet-mvc-storefront/aspnet-mvc-storefront-part-1-architectural-discussion-and-overview) videos.

[Episode 22](http://www.asp.net/mvc/videos/aspnet-mvc-storefront-part-22-restructuring-rerouting-and-paypal) is dedicated to Paypal
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> **Source:** [Paypal add to cart multiple items form with discount](https://stackoverflow.com/questions/7840611/paypal-add-to-cart-multiple-items-form-with-discount/12936117#12936117)
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I have successfully integrated the PayPal express checkout with shopping cart in to one of my Asp.net MVC projects with discount codes, shipping charges etc.