CMD:duel(playerid, params[])
{
        new ID,weap,cost;

        if(sscanf(params, "uii",ID,weap, cost)) return SCM(playerid, 0xFFFF00AA, "/duel ID [weapon ID] [cash]");
        if(Duel[playerid]==1)return SCM(playerid, 0xFFFF00AA, "You already in duel.)");
        if(!IsPlayerConnected(ID)) return SCM(playerid, 0xFFFF00AA, "Player is not connected.))");
        if(ID == playerid) return SCM(playerid, 0xFFFF00AA, "Invalid ID.");
        if(GetPlayerMoney(playerid) < cost)return SCM(playerid, 0xFFFF00AA, "You dont have that much cash.");
		else
		{
		weapNam[playerid]=weap;
		Amount[playerid]=cost;
  		format(Message, 128, "%s has invite you to duel with him with weapon : %s and with winning Amount %d", GetName(playerid),weapNam[playerid],Amount[playerid]);
    	SCM(ID, 0xFFFF00AA, Message);
    	Invite[ID]=1;
		DuelID[playerid]=playerid; // I'm trying to saving playerid here...
		}
        return 1;
}
CMD:accept(playerid, params[])
{
		if(Duel[playerid]==1)return SCM(playerid, 0xFFFF00AA, "You already in duel.))");
		if(Invite[playerid]!=1)return SCM(playerid, 0xFFFF00AA, "You're not invited on any duel.))");
        if(GetPlayerMoney(playerid) < Amount[playerid])return SCM(playerid, 0xFFFF00AA, "You dont have that much cash.");
		else if (strcmp(params,"1",true) == 0)
		{
		ResetPlayerWeapons(playerid);
		ResetPlayerWeapons(DuelID[playerid]);
		format(Message,sizeof(Message),"The duel between %s(%i) and %s(%i) has started",GetName(DuelID[playerid]),DuelID[playerid],GetName(DuelID[playerid]),playerid);
		SCMToAll(COLOR_YELLOW,Message);
		SetPlayerInterior(playerid,10);SetPlayerInterior(DuelID[playerid],10);
		SetPlayerPos(playerid,-973.190856,1060.630981,1345.674316);SetPlayerPos(DuelID[playerid],-1132.407104,1057.550781,1346.410034);
		SetPlayerFacingAngle(playerid,88.169311);SetPlayerFacingAngle(DuelID[playerid],268.964355);
		GivePlayerWeapon(playerid,weapNam[playerid],2000);
		GivePlayerWeapon(DuelID[playerid],weapNam[playerid],2000);
		Invite[playerid]=0;
		Duel[playerid]=1;
		Duel[DuelID[playerid]]=1;
		}
		else if (strcmp(params,"0",true) == 0)
		{
		Duel[playerid]=0;
        Duel[DuelID[playerid]]=0;
        Invite[playerid]=0;
        SCM(DuelID[playerid], -1, "Your Oponent refuse to duel with you.");
		}
        return 1;
}

		if(Duel[killerid]==1 && Duel[playerid]==1)
		{
		Duel[killerid]=0;
		Duel[playerid]=0;
		format(Message, 128, "SERVER : %s have win the duel challenge against %s and got %d",GetName(killerid),GetName(playerid),Amount[playerid]);
		SCMToAll(COLOR_YELLOW,Message);
		GivePlayerCash(killerid, Amount[playerid]);
		GivePlayerCash(playerid, GetPlayerMoney(playerid)-Amount[playerid]);
        }

I'm doing this OnPlayerDeath
But it not giving that amount. why ?