If you want to take an examination of Chinese as a foreign language teacher, IPA and Hanban are the authoritative certification institutions at present. IPA is certified by the International Certification Association, and like certified public accountants, it is certified by this institution. Hanban stopped taking exams in 2005, so now the market has the authority of IPA. If you want to take the exam, I suggest you take the IPA exam. Want to know more details, you can search for "International Registered Chinese Teacher Qualification Certificate" in Baidu, and then click on "International Registered Chinese Teacher Qualification Certificate" Baidu Encyclopedia. There is a corresponding official website in the extended reading at the bottom of the page, and the website has some introductions. You can have a look. Then call the teacher to ask.