If you’ve bought too much, you will need to split the excess amount that you don’t need from the conversion and then cancel it. This can be achieved in two steps: Using the ‘split’ button on the conversion details page, split the excess amount that you don’t need from the conversion. This will create a new conversion with the specified amount and the existing conversion amount will be reduced accordingly. Using the ‘cancel’ button on the conversion details page for the new conversion created with the excess amount, cancel this. The relevant cost for this cancellation will be provided both before and after the cancellation. See Conversion Cancellation section for OANDA FX Payments for more details.