How to get a Cainhurst badge?

Excuse me, could you please elaborate on the process of acquiring a Cainhurst badge? I'm quite intrigued by the concept and would like to understand the steps involved in obtaining one. Are there any specific requirements or qualifications that one must meet in order to be eligible for such a badge? Additionally, is there a specific authority or organization that issues these badges, and what is the significance of having one? Thank you for your time and consideration.