Some properties (such the prices & access list) require the app id. This app id is constructed as follows: <MODID>:<NAME>. The mod id of this mod is 'eyemod' and the name is usually the same as the name of the app (spaces are _). (tip: check the json data of an EyePhone with all apps the see the ids in the 'installed' section, using /data get entity @p SelectedItem). The id for the maps app is for example: 'eyemod:maps'.

Shops

The shop apps are turned off by default. If you like to be able to buy items with your chosen currency (default: emeralds), you can enable the shops in the config. Navigate to your config and change the option: allowShopApps to 'true', This will add both the Food and Util shop to the EyePhone. You can also adjust the items sold in the shop by changing the foodShop and utilShop lists in the config. Use the currency property to change the item that can be exchanged for in-game money.

Spawns

Another feature is the ability to list some predefined spawn locations (like your spawn hub, or the nether hub). This list will be shown in the Spawn app. The locations can be added in the config using the spawnLocation list, you can add locations like this:

["NAME=X/Y/Z/WORLD", "NAME2=X/Y/Z/WORLD"] e.g. ["Spawn=1/2/3/minecraft:overworld", "Nether=1/2/3/minecraft:the_nether", "End=1/2/3/minecraft:the_end"]

Users can also set their own home in the spawn app. By default, players are not allowed to teleport to those locations, however if you turn on the allowHome and/or allowSpawns properties, the player is able to teleport to their home or the spawn locations respectivily. 

Access

Apps can be disabled using the access property in the config. Add apps to this list to enable/disable them. Use 0 to enable the app, 1 to enable the app only for OP's and 2 to completly disable the app. For example:

["eyemod:maps=1", "eyemod:notes=2"]

Most apps enabled by default (0). If you want to disable any OP/cheat app, you can set the disableCheatApps property to true, this disables all the apps that are marked as cheat apps in the code (the base version does not contain any cheat apps, however, some future app extension mods might).

Prices

As for the access, the prices of the apps can also be changed. This works the same as the access, only with the price, for example:

["eyemod:maps=100", "eyemod:notes=0"]

Storage

To prevent large amounts of NBT data, there is a length cap per EyePhone, if this cap is reached, the EyePhone data is cleared automatically. This cap is editable in the maxStorage property. You might want to lower this number if you play on a large server, however, if you play locally, it might not matter that much. The storage is calculated based on the amount of characters in the NBT data. For simplicity, I assume that 1 character is 2 bytes. The player can use the settings app to clear data for a specific app or all apps together.

Bans

Due to the fact that players can freely communicate with each other, some players might abuse this system. Therefore, as an operator of the server (or your SP world), you can ban a specific player in the settings app using their name. This disables that player from communicating using the EyePhone. 

Storage

All the accounts and messages of players are stored per world. An account of a player contains the money and bought apps of that player. The messages are the messages that are send to that player. Those will be retrieved if that player opens their EyePhone (or an EyePhone that belongs to that user is opened). There is a cap of 64 messages that can be stored per player, per app. Additionally the banned players are also stored here, and the board and chat messages. So if you delete the file in the world directory, all this data will be lost.