Hi Jasper,
When you open your project settings and go to the Runtime tab, you have the ability to specify a microflow which triggers 'after startup' of the application.
You can select the microflow AS_StartOAuthRequestHandlers here, or set your own custom 'After Startup' microflow with AS_StartOAuthRequestHandlers as a submicroflow in this microflow. This can be useful if you have more than 1 Microflow which needs to run after your app starts.
similary, what does this statement mean in the same oauth component installation link ??(https://appstore.home.mendix.com/link/app/1414/)