If you ever thought that PInvoke was a pain in .NET, don’t fret, Adam Nathan has a VS.NET addin that you can get from here after using which you wondered, how the heck did I live without this! He also has a PInvoke.NET wiki for you to use and of course contribute to.
If you rather get to it yourself, then there is an wsdl endpoint exposed and Stripe has written a version that is proxy friendly. If you happen to be a Delphi.NET (strange as that might be) kind of guy or gal, you can get the check out Shenoy’s implementation of this.
After installing the add-in you can right-click in the source code to see the following two menu items:
Clicking on the first item opens a dialog allowing you to enter the signature e.g.: