When you create an invoice or visit the payment page, we generate what's called a "live quote".
The live quote is calculated based on the current exchange rate and serves as an estimate only. Should the exchange rate change and you refresh the page, the quote will update accordingly.
The actual exchange rate and transaction fee will only be locked down once your payment reaches our bank account and is ready to be processed. You will be sent an email confirming the final amount.
If paying by card, the accepted live quote will be used to calculate the final payment amount as card payments are immediate. However as bank transfers can incur delays outside of our control, we strongly recommend you make your bank transfer as soon you accept the quote in order to minimise the chance of fluctuations in the exchange rate.