A grease trap pump out is more than emptying a tank. A proper service leaves the trap working the way it was designed to, and leaves you with the paperwork to prove it.
First the operator lifts the lid and pumps out the full load, the liquid, the settled solids at the bottom and the fat cap on top. Skimming only the top layer is the shortcut to avoid: the settled solids are what choke a trap over time.
Then the chamber gets scraped and rinsed down so the baffles and the outlet are clear. The operator checks the inlet and outlet are not blocked and that the baffles are intact, because a damaged baffle lets grease carry straight through no matter how clean the trap looks.
The waste is taken away for licensed disposal, not tipped down the nearest drain. You should get a docket showing the date, the volume removed and where it went. That record is what your trade waste authority wants to see.
Finally the lid goes back sealed. If any of that is missing from a quote, ask. Grease Traps Australia routes your job to a local operator who does the full service, at a fixed price, with the disposal docket included.