You purchase access to use /minions store in game.
The in-game store allows you to purchase any/all of the following minions:
• Miner (Mines the block in-front, upgraded miner smelts ore / can mine multiple blocks in front)
• Slayer (Kills mobs within a pre-configured range)
• Collector (Collects Items within a pre-configured range)
• Feeder (Feeds minions with a pre-configured range)
• Lumberjack (Chops wood & leaves within a pre-configured range)
• Farmer (Farms farmland within a pre-configured range)
• Fisher (Catches fish within water pools located in front of the minion)
• Seller (Sells items found in its attached chest)
◘ Owner of the minions have to be online for minions to work, so make sure you purchase permissions on the right account!
◘ Read more about minions and minion upgrades here.