Merchant is an object type, it's the thing that sells stuff for gold and spams messages like ".. Going soon!"
Here's the list of object types:
"ArenaGuard":ArenaGuard,
"ArenaPortal":ArenaPortal,
"CaveWall":CaveWall,
"Character":Character,
"CharacterChanger":CharacterChanger,
"ClosedGiftChest":ClosedGiftChest,
"ClosedVaultChest":ClosedVaultChest,
"ConnectedWall":ConnectedWall,
"Container":Container,
"DoubleWall"

oubleWall,
"FortuneGround":FortuneGround,
"FortuneTeller":FortuneTeller,
"GameObject":GameObject,
"GuildBoard":GuildBoard,
"GuildChronicle":GuildChronicle,
"GuildHallPortal":GuildHallPortal,
"GuildMerchant":GuildMerchant,
"GuildRegister":GuildRegister,
"Merchant":Merchant,
"MoneyChanger":MoneyChanger,
"MysteryBoxGround":MysteryBoxGround,
"NameChanger":NameChanger,
"ReskinVendor":ReskinVendor,
"OneWayContainer":OneWayContainer,
"Player":Player,
"Portal":Portal,
"Projectile":Projectile,
"QuestRewards":QuestRewards,
"Sign":Sign,
"SpiderWeb":SpiderWeb,
"Stalagmite":Stalagmite,
"Wall":Wall,
"Pet":Pet,
"PetUpgrader":PetUpgrader,
"YardUpgrader":YardUpgrader