How to make a "Buy Item Button"

My inventory has 3 slots. There is a shop in my game that sells items.

It works like this:

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If [Buy Button] is clicked and [Money] is => 25 then sell one item to the player.

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The problem is that when I click that button once, it sells 3 items at once (Inventory has 3 Slots)and fills inventory, plus takes money for 3 items instead of one.

How can I get ONE item only if I clicked [Buy] once?

Try putting your transaction events into a sub-event with a trigger once condition:

If [buyButton] is clicked and [Money] is =>25

    -->[Trigger Once] : TRANSACTION EVENTS GO HERE

Yes, just figured it out! But thank you anyway! Sometimes when trying to think of many things at once, it confuses my brain and then even simple things disappear from my mind... <img src="smileys/smiley13.gif" border="0" align="middle" />

Ah, it happens to all of us, at least you got it figured out ;)