[Nero_3D]

pawn Код:

// in /invite
SetPVarInt(THE_ID_YOU_INVITE, "Invite", 1);

pawn Код:

// in /accept
if(GetPVarInt(playerid, "Invite") != 0) {
    //blabla
    DeletePVar(playerid, "Invite");
    return 1;
}

pawn Код:

// in /decline
if(GetPVarInt(playerid, "Invite") != 0) {
    //blabla
    DeletePVar(playerid, "Invite");
    return 1;
}