[DaRk_RaiN]

Easy.

pawn Код:

new Timer[MAX_PLAYERS];//We'll use this to kill the timer,The reason why there is MAX_PLAYER is because the timer will start for each player, not in global

pawn Код:

Timer[playerid] = SetTimerEx("MyTimer",500,1,"i",playerid);//This will the timer only for the player.
//This is where most scripters fuck up, you should use SetTimerEx in case you want it to start only for the player

pawn Код:

forward MyTimer(playerid);
public MyTimer(playerid)
{
//if(meter[playerid] == 1)//Assuming you used a variable to detect if the meter is true or false
{
//this is the part where you should cost him money, maybe Money[playerid] ++;?
}
//else if(meter[playerid] == 0)//If the meter isn't true.
{
KillTimer(Timer[playerid]);
//That will simply kill the timer.
}