Merchants or Shops in Final Fantasy XV are covered here. As you travel through the Places & Locations of the land you will encounter several different merchants.
There are different merchants scattered throughout the land and perform several different but valuable functions for the party.
Restaurants: Diners are the primary info brokers, where you can eat food to recover from your journey as well as obtain info on Mobhunts.
Arms Vendors: The Weapons these shops sell vary from location to location so it's a good idea to visit every one you come across to find the latest and greatest.
Fishing Shops: These are typically located near Fishing spots and sell different lures and lines.