#include <a_samp>

new TestCP1, TestCP2;

public OnPlayerSpawn(playerid)
{
    TestCP1 = SetPlayerCheckpoint(playerid, 2239.7747, 2430.8074, 3.2734, 3.0);
    TestCP2 = SetPlayerCheckpoint(playerid, 2243.4456, 2490.6458, 3.2734, 3.0);
    return 1;
}

public OnPlayerEnterCheckpoint(playerid)
{
    if(TestCP1)
    {
        SendClientMessage(playerid, 0xFF0000FF, "You have entered CheckPoint 1");
        return 1;
    }
    
    if(TestCP2)
    {
        SendClientMessage(playerid, 0xFF0000FF, "You have entered CheckPoint 2");
        return 1;
    }
    return 1;
}

//OnTopOfScript
new CheckPoint[MAX_PLAYERS];

enum //Just add checkpoints here
{
cp1,
cp2
}

public OnPlayerEnterCheckpoint(playerid)
{
switch(CheckPoint[playerid])
{

case cp1: 
{
//stuff for cp1
}
case cp2: 
{
//stuff for cp2 here
}

}
return 1;
}

Important Note: You can only show one checkpoint at a time. If you need more, create the checkpoints only when the player is near.

enum //Just add checkpoints here
{
cp1,
cp2
}

#define CP_NONE 0
#define CP_STORE 1
#define CP_AMMUNATION 2
new CheckPoint[MAX_PLAYERS];
forward UpdateCheckPoint();
public OnGameModeInit()
{
    SetTimer("UpdateCheckPoint",1000,1);
    return 1;
}
public UpdateCheckPoint()
{
    for(new playerid;playerid<MAX_PLAYERS;playerid++)
    {
        if(IsPlayerInRangeOfPoint(playerid,5.0,X,Y,Z))CheckPoint[playerid]=CP_STORE;
        else if(IsPlayerInRangeOfPoint(playerid,5.0,X,Y,Z))CheckPoint[playerid]=CP_AMMUNATION;
        else CheckPoint[playerid]=CP_NONE;
    }
}

public OnPlayerEnterCheckPoint(playerid)
{
    switch(CheckPoint[playerid])
    {
        case CP_NONE: return 1; //Do nothing
        case CP_STORE:
        {
            //Do stuff
        }
        case CP_AMMUNATION:
        {
            //Do stuff
        }
    }
    return 1;
}