Upgrade HubSpot ASP.NET MVC Prototype to use Oauth 2.0

This is a request to convert/upgrade an existing prototype HubSpot Integration to use Oauth 2.0 instead of an HAPIkey for authorization and authentication. I will provide an existing Visual Studio 2015 MVC C# solution that is referenced in this article: [login to view URL] and uses the following routine: [login to view URL] Your task is to return the VS 2015 solution with same functionality (create a contact) by adding methods to use Oauth authentication. You will provide documentation on any further steps required on the HubSpot site. I can provide the Client ID for the HubSpot App. Documentation on HubSpot and Oauth is available here: [login to view URL] Please ask any questions. New freelancers seeking to build a reputation are welcome but you must know Oauth. Time is of the essence, so early submissions have the best chance of being accepted. To eliminate automated responses and freelancers who cannot read or follow instructions, you must include in your response the phrase: "I can substitute HAPIkey for Oauth 2". Without the phrase, your proposal will be declined.