Gets the OAuthBased instance for the D-Bus interface <link linkend="gdbus-interface-org-gnome-OnlineAccounts-OAuthBased.
top_of_page">org.gnome.OnlineAccounts.OAuthBased</link> on this, if any.
| this |
A Object. |
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A OAuthBased that must be freed with unref or null if this does not implement the interface. |