Permission Nodes

ChestShop's permission nodes(top)

Permission nodes enabled by default:(top)

ChestShop.shop.* - lets you create shops, buy from them and sell to them
↓ (it grants people these nodes)
ChestShop.shop.create - lets you create shops
ChestShop.shop.buy - lets you buy from shops
ChestShop.shop.sell - lets you sell to shops

Other permission nodes:(top)

ChestShop.shop.buy.(itemid) - lets you buy only specific items from shops
ChestShop.shop.sell.(itemid) - lets you sell only specific items from shops
ChestShop.iteminfo - allows access to the /iteminfo command
ChestShop.admin - (granted to OPs) - lets you create Admin Shops and create/destroy other people's shops
ChestShop.mod - lets you look into other shop chests
ChestShop.name.someName - lets you create, destroy and access shops for other person, here it's "someName". Hint: You can use ChestShop.name.* for all player. Same with the permissions below.
ChestShop.othername.create.someName - lets you create shops for other person, here it's "someName"
ChestShop.othername.destroy.someName - lets you destroy shops for other person, here it's "someName"
ChestShop.othername.access.someName - lets you access shops for other person, here it's "someName"
ChestShop.nofee - you don't have to pay shop creation fee
ChestShop.notax.buy - you don't have to pay tax when buying at a shop
ChestShop.notax.sell - you don't have to pay tax when selling at a shop

More ChestShop.shop.create nodes(top)

ChestShop.shop.create.buy - lets you create buy-only shops
ChestShop.shop.create.sell - lets you create sell-only shops
ChestShop.shop.create.(itemid) - ...shops that sell specific items
ChestShop.shop.create.food - ...shops that sell food
ChestShop.shop.create.diamondgrade - lets you create shops that sell diamond-grade items
ChestShop.shop.create.irongrade, ....goldgrade, ...stonegrade, ...woodgrade
ChestShop.shop.create.diamondarmor, ...goldarmor, etc.
ChestShop.shop.create.diamondtools, ...goldtools, etc.
ChestShop.shop.create.ore
ChestShop.shop.create.ingots
ChestShop.shop.create.monsterdrops

Even MORE permissions?(top)

Take a look at the plugin.yml for all permissions e.g. possible item categories.