There is no interview. You are invited to take a 3 part qualifying exam. You will be given a guidelines that is around 160 pages that you must read. You will be limited in the amount of time to successfully finish all 3 parts of the exam. You must past each part in order to be given access to the next exam. You will receive notice of passing the first 2 exams very quickly. If you fail any of the 3 exams you may be given an opportunity to retake all 3 parts again.

There was a manual/instructions to read and then a quiet challenging online test on the topics of the instructions, required a lot of attention to details. It was a while ago, maybe the interview process is different now.