How do I use MS-XCEP and MS-WSTEP in .NET or javascript to get a certificate from AD CS?

Active Directory Certificate Services offers a web service that implements MS-XCEP and MS-WSTEP for non-domain connected computers to submit a certificate request.

This certificate can be used for digital signatures, encryption, and more.

Is there a WSDL I can use to interact with these web services? How should I interact with them in C# or Javascript?