There is another way of invoking the Online Accounts panel, which doesn't involve passing through the System Settings. You can use the Setup class from libonline-accounts-client-dev (it also comes with a QML API) to invoke it.
There is another way of invoking the Online Accounts panel, which doesn't involve passing through the System Settings. You can use the Setup class from libonline- accounts- client- dev (it also comes with a QML API) to invoke it.