Hello,
I've read these articles and I think I finally accomplished domain wide delegation with oauth2.
But, a marketplace application will be authorized by the domain administrator while installation.
For testing, I have to install my app on my domain.
But, according to this article, I can't create an application for testing on Google Apps Marketplace easily.
I have to pay Chrome Web Store developer registration fee,
and record a screen capture video.
And the application will be published.
I have to publish the "Hello World" app for testing?
Will it be approved?
Anyone know a better way?