For those of you who’d prefer to generate an OAuth refresh token using only a browser, there's a new guide on how to use the OAuth 2.0 Playground:

The guide walks you through the authorization setup required by the AdWords API for a Web application--via a browser session--without the need to execute any command-line scripts.

More OAuth resources
Still have questions? Feel free to visit us on the AdWords API Forum or our Google+ page.