Anduin was quite interested in this. In his plans, he wanted to see more of the world after graduating from Hogwarts, perhaps by taking a magical journey around various countries. If he could get a certificate like this, he might even earn some extra money if he ran into a Dark Wizard abroad.
So Anduin asked Frank how to apply for this kind of status, only to discover that the certificates were handed out very casually. You just had to submit an application to the Department of International Magical Cooperation. As long as you had no criminal record, practically anyone could get one.
As for why you had to apply through the Department of International Magical Cooperation rather than the Department of Magical Law Enforcement, it was because the profession had first appeared in the American Ministry of Magic, and the Wizengamot had recognized it too. From there, it had spread to other countries. After all, it helped ease the burden of crime on each country's Ministry of Magic. Of course, if you caused damage locally while pursuing a suspect, the local Ministry of Magic would arrest you and send you home.
After learning some of the Ministry of Magic's and the Aurors' inside secrets, Anduin grew deeply concerned about the current situation. The two sides were completely mismatched in terms of information. If this world didn't unfold as it had in his hazy memories of his Previous Life, with the Dark Lord attacking Harry and being defeated, the conflict might sink into a prolonged quagmire of war.
Anduin didn't know whether Dumbledore's protection of Lily's family would change history, but if it really did, then the Magical World might remain in turmoil for a long time to come.
A life without security was not what Anduin wanted. The only