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Here are two examples using that:

varlinkctl introspect /run/systemd/io.systemd.Credentials

and

varlinkctl call /run/systemd/io.systemd.Credentials io.systemd.Credentials.Encrypt '{"text":"foobar"}'

The 2nd argument always specifies the entrypoint socket to talk to. In most cases where you call this locally that's the file system path of an AF_UNIX socket. However this can also be the path to an executable, in which case the executable is invoked and told via $LISTEN_FDNAMES (i.e.