Has anyone been able to integrate SharePoint with NetSuite using Token based authentication?

I have. I used a suitelet to call sharepoint and get an access token, get sharepoint data, and write it to a form. I then used a user event to iframe it to a sublist on a before load

We are doing the opposite. We have a workflow in SharePoint that calls a NetSuite RESTlet to pull a vendor record and update that vendor record with a Sharepoint Link that points to a PDF document. Weere were using the username and password but with the new requirements we are trying to get the TBA signature generated on the Sharepoint side. From what our Sharepoint developers have stated, Sharepoint does not support OAuth 1.0.