setExpressCheckout and SSL/TLS error

Question

I\'m trying to develop a simple application that will enable users to purchase services off a website through the Paypal API. This application is running on ASP.NET with C#.

Answer 1

Thanks a lot that really helps me.

For reference here is my code for establishing the interface in VB.NET

  'Create a service Binding in code
                            Dim ppEndpointAddress As New System.ServiceModel.EndpointAddress("https://api-3t.sandbox.paypal.com/2.0/")
                            Dim ppBinding As New System.ServiceModel.BasicHttpBinding(System.ServiceModel.BasicHttpSecurityMode.Transport)

                            Dim ppIface As New PayPalAPI.PayPalAPIAAInterfaceClient(ppBinding, ppEndpointAddress)

                            Dim ppPaymentReq As New PayPalAPI.DoDirectPaymentReq()

                            ppPaymentReq.DoDirectPaymentRequest = ppRequest