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SHOP PLUGIN CONFIG
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#Harming Arrow
      440:
        type: item
        item:
          material: 440
          quantity: 1
          damage: 0
          name: "&cArrow of Harming"
          lore:
            - "Used In the Wooden Cannon"
          potion:    #this is how i make the arrow look correct in the Shop GUI
            type: INSTANT_DAMAGE          #and this bit OFC
        buyPrice: 3
        sellPrice: -1
        slot: 10
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Cannons Projectile config
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general:
  #the name of the projectile displayed in game
  projectileName: Instant Damage Arrows
  #a short description of the projectile
  description: "Rain down a bunch of instant damage potions"
  #the name of the item to load this projectile
  itemName: "Arrow of Harming"
  #the item which is associated with the projectile.
  #items can be assigned to many different projectiles which are used with different cannons
  #example: one cannon can be loaded with stone but will fire an armor piercing round, while a different cannon
  #can be loaded with stone and it will fire an explosive projectile (minimum is id:data. Named items id:data:displayName:lore1:lore2:....)
  loadingItem: '440:0:&cArrow of Harming:Used In the Wooden Cannon'
  #some item create a block when placed e.g. redstone dust makes a wire if placed on ground.
  #if you load the dust, type in the wire id and data, else there is a wire on the cannon.
  #minimum is id:data. Named items id:data:displayName:lore1:lore2:....
  alternativeId:
    - 'NONE:0'

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The above configs result in the cannon not accepting the Item. However removing the &c from both configs results in it working.
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