It is extremely important to have a dialog that requires the user to confirm a transaction where they are purchasing in-game goods with tokens.
I had planned to top up my cash balances for a long time and had finally set aside 85 tokens from the income I receive by my sponsor.
I have a mouse that has, as of two weeks ago, decided it is okay to double click as it pleases when clicked once.
That resulted in spending 170 tokens, before the dialog confirming a successful transaction appeared.
If I were a manager who purchased 180 tokens, that'd would be very unsavory.
(I'd at least like to reverse the second transaction, if possible)