[ATGOggy]

Do it under OnPlayerRequestSpawn callback

PHP код:

public OnPlayerRequestSpawn(playerid)
{
    if(GetPlayerSkin(playerid)==//Donator's skin id)
    {
         if(PlayerInfo[playerid][Level]<2)
         {
              SendClientMessage(playerid, -1, "You must be level 2 or above to select this class.");
              return 0;
          }
     }
     return 1;
}