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Hi Skywards,
that's pretty simple.
You have to pay the tickets (plane, train, ship, bus, etc.) in advance and bring them with you to the Big Day to Maastricht.
Before the stages you meet in the cantine (where I really recommend the bio-kiwi+orange juice) and get a small briefing from Sarah or Imke about how your day's gonna look like and that's the time you have to pass the paper that contains your bank account info plus the tickets.
If you forget something, that's not a big problem, you can send it later but obviously, the reimbursement will arrive later to you account.