i have try add comman to Server Rewards , player can buy this comman , but have vehicle spawn. can fix it ?

They need a permission and I doubt its a good idea to do this.

yes have add permission to spawn, but when buy done , no have car to spawn , have try with admin , but no have any spawn when use serverrewar :D 

Well it should execute the command as a player not server, ask server rewards developer

This mod is so cool! I'm gonna try to use Server Rewards to grant the permission. I've used Server Rewards for spawning a mini, but it often fails or people aren't on level terrain. Having the players purchase the permission then use their own vehicle seems the most prudent way to go.

  "commands": {
    "Flying Vehicles": {
      "description": "Controls available at https://umod.org/plugins/flying-vehicle#usage",
      "iconName": "https://assets.umod.org/images/icons/plugin/5edd4c0a2d988.png",
      "commands": [
        "oxide.grant user $player.id flyingvehicle.use"
      ],
      "displayName": "<color=white>Flying Vehicles!</color>",
      "cost": 10000,
      "cooldown": 0
}

Maybe I'll just add another command to spawn it later