Please, add an option so the player can pay to skip cooldowns:

          "spawnCooldown": 3600.0,
          "recallCooldown": 10.0​

This will make the plugin and configuration more and more complicated...lol

Well, take a look at this one. 1.2K watchers and everyone seems happy...
But, it's just a suggestion, of course it's up to you to decide.

Thanks for this one, it's perfect, but...
Please, extend lang phrases to include pay command and amount. Something like

                ["VehicleOnSpawnCooldown"] = "You must wait <color=#FF1919>{0}</color> seconds before you can spawn your <color=#009EFF>{1}</color>. If you want to bypass this cooldown by paying <color=orange>{2}</color>, use command <color=yellow>{3}</color>",
                ["VehicleOnRecallCooldown"] = "You must wait <color=#FF1919>{0}</color> seconds before you can recall your <color=#009EFF>{1}</color>. If you want to bypass this cooldown by paying <color=orange>{2}</color>, use command <color=yellow>{3}</color>",​