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I'm not quite sure what constitutes as a Professional/Occupational License, as there is no list. I'm assuming careers like nursing and trade unions are a given. But how long is the list?
For my example I've been in the Food, Beverage and Hospitality for almost a decade now. I was at a point to studying to become a certified wine educator. I got as far as "advanced" but no "diploma". The link below explains a lot more of what the certifications entail.
https://www.wsetglobal.com/qualifications/wset-level-3-award-in-wines