how to keep the key of user?

I have written a script for a game machine, but I can't get it to keep the key ID of the user...
I get the key, when the user pay the mechine, but because it changes states a couple of times, the key is not stored... have used llGetOwner() for testing, but need for something to get the user key.
my script looks like this:

.
.
key user;
default
{
    state_entry()
    {
        llRequestPermissions( llGetOwner(), PERMISSION_DEBIT );
    }
    run_time_permissions(integer perms)
    {
        if (perms & PERMISSION_DEBIT)
        state PermissionGiven;
    }
}

state PermissionGiven
{
    money(key id, integer amount)
    {
        if (amount != price)
        {
            llWhisper(0,"Sorry!  The price is $" + (string)price);
            llGiveMoney(id,amount);
        }
        else
        {
            state GoOn;
        }
    }
}

state GoOn
{
    state_entry()
    {
        .
        .
        state game;
    }
}

state game
{
    state_entry()
    {
        llListen(Channel,"",user, "");
        user = llGetOwner();                    // KEY ISSUE!!!
        llInstantMessage(user, "Game startet!");
        .
        .
        .

(I have greatly reduced the code, to make it easier to read)
What I need is a way to get the key of the user, instad of using "llGetOwner()" as I am done testing.

In the code posted you never store the user id into the user variable?
in your money event before switching to state GoOn store the id of the person who just paid.

Which they mean store it in a global variable. Right now it's only being stored to a local variable when they pay, which is lost once it changes states.

Well the variable user is already declared, I just dont think it is being updated.
What I meant was

state PermissionGiven 
{ 
    money(key id, integer amount) 
    { 
        if (amount != price) 
        { 
            llWhisper(0,"Sorry!  The price is $" + (string)price); 
            llGiveMoney(id,amount); 
        } 
        else 
        { 
            user = id;
            state GoOn; 
        } 
    } 
} 

ah, thank you very much!
I tried using

user = llDetectedKey(0);

to get the key, but that didn't work.
though the

user = id;

did!
thx a lot for the help

llDetecteded functions only work in sensor, touch and collision events