llGiveMoney() - does it?

I have a script which sells something - I am trying to handle under and overpayment using the Pay button.

My script looks very much like the one in the LSL wiki where we test the amount paid against the required amount (cost) and if different refund the amount.

Calling llGiveMoney() appears to have no affect at all. Here is the money handler:

    money(key id, integer amount)    
    {
        if (amount != TSHIRT_PRICE)
        {
            llSay(0, "I'm sorry but you have tendered an incorrect amount. We are refunding your payment.");
            llGiveMoney(id, amount);
        }
    }

When this code runs (when an avatar pays the object an incorrect amount) I can see the L$ debited from the account after the Pay but the llGiveMoney() seems to have no effect.

Am I making some dumb amateur error here?

You are requesting PERMISSION_DEBIT from the object owner first, right?

Errr, no! I never thought it would be required since I am not debiting money from an agent but giving it to an agent! I will of course add the permission request. Thanks.

Yumi's right and you are debiting it from an agent - objects don't hold money, the money you pay goes directly to the owner. When the object apparently gives a refund, it is (naturally) the object's owner that actually pays out.

I see now. For some reason I had assumed that objects owned by me had the ability to take funds from my account and give them away without additional requirements Thanks for clarifying.

The permission is so that someone doesn't give you an object that then empties you account.