In the Categories.json I added "command/slotmachine", to the list of items.
Here is the Commands.json
{
"slotmachine": {
"DisplayName": "Personal Slot Machine",
"Image": "https://www.dropbox.com/s/f80amu81z8uy3te/slotmachineiconsmall.png?dl=1",
"Message": "You may now gamble in the comfort of your own base! Good Luck, {playername}!",
"Command": "slotmachine.give {playername}",
"BuyPrice": 10,
"Currency": "rp",
"ShowDisplayName": true
}
}
The Message is sent and shows, but does not replace the placeholder with player's name. Using that command via external RCON or F1 console does work, replacing {playername} with name. On a side note, I do use the {playername} tag on the main page of the Welcome Panel and it does work nicely.
Thanks for the help.