It has a timing BELT with 100% certainty. I speak from experience because mine was changed under warranty at about 55,000km owing to a squeaking noise that turned out to be a water pump issue.
Unlike the petrol engines, the PSA diesel doesn't use a timing chain. Hence, no death rattle in the Doopers.
The timing belt should be changed between 120,000 and 150,000km. Out of warranty cost will be about 800 euros at a dealership; it's tight in there and they have to remove quite a bit to access the belt. For this reason, if and when you do it, have them do the water pump at the same time.
Also, please do not change the oil by following the on board computer schedule. These changes are far too infrequent. I do minimum 2 oil changes per year - once in the spring after the winter season and once in the fall before winter starts. Depending on how much mileage you do, you might want to consider even more frequent changes.
Aside from that, these engines are quite bulletproof. Oil and filter is about all you will need - possibly brakes as well as the heavy diesel engine in the front tends to cause excessive wear to the front pads (takes a bit of friction to stop the weight).
Make sure the car gets a good highway run at least every 3000-5000km so as to engage the diesel particle filter cleaning cycle. You'll know it's running because the car will lose some power and the exhaust will get more "throaty".
Be sure to inspect the hood of the car above the turbocharger for the presence of soot. In some instances, these cars develop pre-cat leaks and soot accumulates on the turbo and directly above the turbo on the underside of the hood. This problem needs prompt attention if it occurs.
Anything else you want to know, just let me know.
Oh yeah, congratulations and welcome!