Are there any problems to buy a Thalys ticket for a trip from Brussels to Paris?

Question by Vasily D: Are there any troubles to acquire a Thalys ticket for a trip from Brussels to Paris?
Is it far better to book in advance (which takes time) or it is considerably simpler to acquire a ticket durectly ahead of the departure? Thanks

Ideal answer:

Answer by Prof. Science
its simpler to acquire a ticket when you arrive in paris (paris is the capital of France)

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