Upvote:1
As written in a comment by @jcaron:
The ticket pick-up is in the southern passageway, close to platforms 1-6. It's 'behind' the Eurostar area if you come from the main passageway. Hard to find a map where it's visible.
Quote slightly doctored to make it easier to understand.
The map is no longer available, site is now private.
I found two maps of the station, one in many versions.
And this one.
Neither has the information about the pick-up point. Although the location should be included in the map, there is not label to identify it.