[Riddick94]

I have already told you!

pawn Код:

#include        "a_samp"

public OnPlayerSpawn(playerid)
{
    SetPlayerCheckPoint(playerid, X, Y, Z, Size);
    // X, Y, Z - Coordinations of your Checkpoint.
    // Size - Size of checkpoint.
    return true;
}

public OnPlayerEnterCheckpoint(playerid)
{
    DisablePlayerCheckpoint(playerid);
    // ShowPlayerDialog(playerid, [...]);
    // Later you can create again next checkpoint. To make it more dynamic use Streamer Plugin.
    return true;
}