Lack of Information on Documentation and Error while Requesting Request Token Url

Your documentation have only java integration example and is using a Google api. If you, could provide some proper doc or and reference so that I can use the follow in other language too.

Doc like, what will be the payload for which post request.

Example - Making a POST request on https://{project} expect payload like


and Rather than that I am getting this :disappointed_relieved:

Error - net.oauth.OAuthException: Signature length not correct: got 632 but was expecting 128

here is the image -

P.S. - I am working in .net core 2.0 and want to use OAuth flow