Players can trade with each other using money ($), and there are a few ways to do this.
While not reccomended, it's possible to drop items for another player and pay with /pay. The advantage of this method is its speed, although there's no garuntee either side will uphold their end of the bargain, so use caution when doing this.
Player shops are made on player islands. Unlike most other servers, there are no spawn plots. To establish a shop, you can follow the guidelines outlined in the guide section.
Players of non-skyblock modpacks can purchase shop plots from their server's spawn area. These cost a considerable amount of money but allow you to create and maintain a shop which players can interact with using the Quickshop plugin. Players are not permitted to set their prices below what is outlined in the shop policy.