Mystery shoppers will be hired to act as an everyday customer. Giving their opinion on experience, hospitality and so on. You can never really earn much from being a mystery shopper, up to $30 a job, or a free meal or gift vouchers. You will never become rich from acting as a mystery shopper.
You can take part by joining a survey program.
Anyone can be a mystery shopper, there is no qualifications involved, any age, any background. Although you will need a few personal skills to get through. You must be observant and have a good memory as you will have to repeat your experience back to base. You must also be very discreet and never show you are a mystery shopper, because in effect you are undercover.