If you're really like to become a mystery buyer,
I recommend that you consult the association of Mystery Shopping
Providers. They have a certification program for Mystery Shopper,
and it seems that many of the companies that I looked, it did investigate
whether applicants had completed this course.
The work requires good writing skills, strengths and skills of
observation. Remember, this is a job.Treat it as you would with
any other job. Be profressional in your questions and check the
company out thoroughly.
The following links connect to agencies that are either members
of the American Marketing Association (AMA) or the Mystery Shopping
Providers Association (MSPA). Note that I am not affiliated with
any of these companies and just purely for sharing purposes.