Secret Shopper provides shops for veterinary clinics and sit-down restaurant. Most of these are not paid shops but they do reimburse you a certain dollar amount. For instance, if you go to a specified restaurant and spend $40, Secret Shopper will reimburse up to $25 (not including tip).
This will be explained before you accept the shop. They offer lunch and dinner shops so keep a look out. Even if you don’t get paid for the shop, you get a free or very cheep meal or vet visit. Also, this company sends payment by check not paypal.