We've developed an add-in and are looking at how to publish it on the ArcGIS Marketplace. The steps look straightforward until the "register an app" part (Register an app—ArcGIS Marketplace Help | ArcGIS); there's no clear set of instructions for add-ins afterwards. Any code or configuration changes we need to apply to the add-in? How does the OAuth 2.0 requirement apply to add-ins? Any help would be appreciated.