Complete Github Connect

What GitHub appended to the callback, relayed by the app's callback page.

One GitHub return, as a state the callback page renders.

status: ready (source set), choose_one (the installation covers other than exactly one repository: settings_url is where the founder narrows it), pending_approval (an organization owner must approve), reauthorize (go to authorize_url, which carries a fresh state), no_installation, expired, or refused (message is the founder-facing reason, reason its class).