CMS.Ecommerce.Web.UI.CMSPaymentGatewayProvider CMS.Ecommerce.Web.UI.ShoppingCart.PaymentGatewayProvider Property
Return type of class property 
CMS.Ecommerce.Web.UI.CMSPaymentGatewayProvider CMS.Ecommerce.Web.UI.ShoppingCart.PaymentGatewayProvider
was changed to 
CMS.Ecommerce.CMSPaymentGatewayProvider
.