Sample App Demonstrating quickbooks-ruby and QB Online OAuth 2.0 Expose Local Development ngrok http -subdomain vinoqbwc 4567 Links OpenID Discovery Document https://developer.intuit.com/.well-known/openid_configuration/ Implement OAuth 2.0 https://developer.intuit.com/docs/0100_quickbooks_online/0100_essentials/000500_authentication_and_authorization/connect_from_within_your_app#/Refreshing_the_access_token OAuth 2.0 Playground https://developer.intuit.com/docs/0100_quickbooks_online/0400_tools/0020_oauth_playground Access the QuickBooks Online API with OAuth2 by @minimul http://minimul.com/access-the-quickbooks-online-api-with-oauth2.html?utm_source%3Dnewsletter%26utm_medium%3Demail%26utm_campaign%3DQuickbooks+Ruby+Newsletter+Issue+25