The Shop

shop_catalog/general.json is the Shop's price list, shown on screen in the order of the file:

{
  "entries": [
    { "item": "minecraft:cookie", "buy": 1 },
    { "item": "chiikawa:whistle_candy", "buy": 1, "count": 4 },
    { "item": "minecraft:wheat", "buy": 2, "sell": 1 },
    { "item": "minecraft:potato", "sell": 1 }
  ]
}

Field	Meaning
item	The item
buy	Optional, how much to pay for count of it; leave it out and the Shop doesn't sell it
sell	Optional, how much you get for selling count of it to the Shop; leave it out and the Shop doesn't buy it
count	Optional, how many are bought or sold at a time, 1 by default; for example, 4 Whistle Candy for 1 emerald

Prices are in the currency from the currency tag. Replacing this file replaces the whole price list, so if you want to keep the original items, remember to write them in too.

Pets only buy what the Shop sells, and only things they like. What each character likes is written in its personality file; see Personality.