new Pickupname; // Global variable for your pickup NOTE: Outside any callback
Pickupname = CreatePickup(model, type, Float:X, Float:Y, Float:Z, Virtualworld); // Stores the createpickup in the variable NOTE: Put this in ongamemodeinit
public OnPlayerPickUpPickup(playerid, pickupid)
{
    if(pickupid == Pickupname) // Checks if you picked up the pickup
    {
    // if you pickup the variable "Pickupname"
    }
    return 1;
}

new tec9; // Definig the pickup.



tec9 = CreatePickup(372, 2, 1503.3359, 1432.3585, 10.1191, -1) // The pickup itself.

public OnPlayerPickUpPickup(playerid, pickupid)//When player picks a pickup.
{
    if(pickupid == tec9) GivePlayerWeapon(playerid,32,200); // Giving the player the teec9 when he picks the tec-9 with 200 ammo.
    return 1;
}