What are the absolute essentials a cyclist should own? Context:
My bike shop includes free servicing as a standard with a new bike. I don't need such thing and live too far away. In lieu of waiver I can get €100 of stuff from the shop.

Best bike problem ever: I need to decide what to get for free form the bike shop...

Can anyone advise on what they would consider to be absolute essentials as a road/touring cyclist?
This is what I tell everyone to get first when they get a new bike:


Seatbag, to hold the following:
Spare tube (maybe two)
Small multitool 
Mini-pump or CO2 inflator 
Tire patch kit 
2x tire levers


That assumes you have bidons and cages.  Those six things should get you by for many miles and should get you out of any trailside emergencies.  As with anything though, make sure you know how to use them when the need arises.  For your own personal bike shop, I'd recommend a good floor pump with a pressure gauge, some high quality chain lube, and a maintenance book for DIY repairs.

Also a helmet should be entirely recommended as a required purchase, and probably front and rear lights.  Nothing hurts worse then getting hit by a motorist that "didn't see you" at an intersection.