Cyberpunk 2077 - Gig An Inconvenient Killer

I'll cut to the chase. Jack Mausser - NC-s gonkest merc. Did a recent job for me and went too far. Way too fucking far. He was supposed to klep some shards from a Zetatech transport - quiet-like. Except it wasn't fucking quiet. That psycho offed every single guard, beheaded the driver and blew up the truck. Corp's foaming at the mouth, searching high and low for the prick, and I'll be damned if I go down 'cause of him. I need you to toss his head at their feet. Maybe then they'll let this go.
Mausser owns a seedy club downtown called 7th Hell. Gut tells me he's holed up there till the smoke's cleared. I need you to get inside the club and take his psycho ass down - preferably on the down-low. Understood? Good. Let me know when it's done.

Get inside 7th Hell.
Find Jack Mausser
Avoid entering combat inside the club [Optional].
Get to Jack Mausser in VIP area.
Neutralize Jack Mausser.
Talk to Jack Mausser [Optional].
Carry Mausser to the fixer's car [Dependent].
Leave the club.
Collect your reward from the Drop Point.

As for the various ways of doing this missions and its outcomes:
If you avoid entering combat (meet the optional objective), you will always get the full reward (30.5k credits at level 60), regardless of how you handle Mausser. Otherwise you get a diminished reward (19.1k credits at level 60).
The basic ways of dealing with Mausser are
Talking to him which can result in two outcomes. You can convince him to leave NC. Dino will be impressed that you managed to persuade Mausser to leave. The other outcome is that either V or Mausser will decide to become hostile.
Killing or incapacitating him.
If you kill him, the objective will change to leaving the club. Dino will be happy but will say that he needs a drink.
If you incapacitate him, the objective will change to carrying him to a car waiting outside which is sent by Dino. Dino will be impressed and express "mad respect".
The conversation with Mausser can be avoided if you kill or incapacitate him before entering the VIP room.
You can still kill or incapacitate Mausser after successfully having convinced him to leave NC.
Dino's dialog upon completion does not depend on meeting the optional objective. It only changes depending on what happens to Mausser. However, Dino will be happy, no matter what happens.
Attempting to shoot or quickhack Mausser may fail the "Avoid entering combat" objective. However, you can use System Collapse on him through the camera, rendering him unconscious without failing the optional objective. The main objective will then switch to carrying Mausser out of the club.
Entering the room while Mausser is alive will always initiate a conversation regardless of any stealth abilities. With the correct dialogue choices, you can convince Mausser to leave the city and still collect the full bounty.
If you disable the camera in the VIP room, by having previously turned it off (security/hack) and physically break the device (hands/blunt) during the conversation with Mausser. You can allow the conversation complete and the objective will clear. Mausser will say "tell them the job is done", and begin pacing. At this point, you can grab Mausser and kill him while avoiding failing the no combat optional objective. Leave the club and receive a positive follow up from Dino and directions to a deposit box for your bonus. And the satisfaction of truly accomplishing all the objectives.
To kill Mausser without having a conversation, avoid entering his room until he is dead. Switch off the camera in his room, use distract on the TV, Use a high Damage Knife throw on his head (requires perk, possible substitute with silenced revolver). Alternatively, take control of the camera and use the System Reset Quickhack on Mausser through the camera.