/usr/lib/systemd/user/org.gnome.GPaste.Applet.service is in gpaste-applet 3.22.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Description=GPaste applet
[Service]
Type=dbus
BusName=org.gnome.GPaste.Applet
ExecStart=/usr/lib/gpaste/gpaste/gpaste-applet --gapplication-service
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