We are mostly US and Canada shoppers, so really would not know. Let me suggest to you that the MSPA [
www.mysteryshop.org] is an organization of companies that do mystery shopping. If you explore their website for your area you may find companies that shop your country. Similarly, you may want to use a Google search, trying "Mystery shop Muscat" or "Mystery shop Oman" or even "Mystery shop _____" where you fill in the blank with businesses you see in your area. Most frequently it is the chain stores that are shopped.