"Mini Copter Vehicle": {
      "Purchasable": true,
      "Display Name": "Mini Copter",
      "Use Permission": true,
      "Permission": "vehiclelicence.minicopter",
      "Distance To Spawn": 8.0,
      "Time Before Vehicle Wipe (Seconds)": 0.0,
      "Exclude cupboard zones when wiping": false,
      "Maximum Health": 0.0,
      "Can Recall Maximum Distance": 0.0,
      "Can Kill Maximum Distance": 0.0,
      "Minimum distance from player to recall or spawn": 2.0,
      "Remove License Once Crashed": false,
      "Commands": [
        "mini",
        "minicopter"
      ],
      "Purchase Prices": {
        "Economics": {
          "amount": 5000,
          "displayName": "Dollars"
        }
      },
      "Spawn Prices": {50},
      "Recall Prices": {100},
      "Recall Cooldown Bypass Prices": {},
      "Spawn Cooldown Bypass Prices": {},
      "Spawn Cooldown (Seconds)": 1800.0,
      "Recall Cooldown (Seconds)": 30.0,
      "Cooldown Permissions": {
        "vehiclelicence.vip": {
          "spawnCooldown": 900.0,
          "recallCooldown": 10.0
        }
      },
      "Amount Of Fuel To Spawn": 0,
      "Refund Fuel On Kill": true,
      "Refund Fuel On Crash": true
    },

So this is the mini as an example. I made the spawn prices and recall prices and it doesn't load the config. Even if I remove the brackets {}it still won't load.

Also, side note just thought of this. Is it possible to add a renew license? If a player crashes/ damages a their vehicle rather than removing the license and having to pay full price again they must pay a smaller fee to get it back

iirc  you need to place

the  same arguments for each   command so use 

so look something like

"Purchase Prices": {
"economics": {
"amount": 50,
"displayName": "Money"
}
},
"Spawn Prices": {
"economics": {
"amount": 50,
"displayName": "Money"
}
},
"Recall Prices": {
"economics": {
"amount": 50,
"displayName": "Money"
}

changing the values to match yours, if you where to add cooldown prices you would need to add economics and price arguments in the same way you did "purchase price"