Synchronously invokes the <link linkend="gdbus-method-org-gnome-OnlineAccounts-Account.
EnsureCredentials">EnsureCredentials</link> D-Bus method on this. The calling
thread is blocked until a reply is received.
See call_ensure_credentials for the asynchronous version of this method.
| this |
A AccountProxy. |
| out_expires_in |
Return location for return parameter or null to ignore. |
| cancellable |
A Cancellable or null. |
|
true if the call succeeded, false if throws is set. |