The owner of the property specifies which currency they require the booking payment to be made in. This can be £ (GBP), $ (USD) or € (EUR). On Clickstay you can select from the menu bar the currency you would like to view prices in. If you are viewing properties in a currency different to what an owner has set for payment, this will be highlighted on the check-out page where you will be able to see which currency the owner requires payment in, and the total booking costs in that currency.
If you are booking a property that requires payment in a different currency from your bank account, you can pay in the usual way using one of the accepted payment methods. Please note that when you receive a bank statement, the amount may be different to the total booking cost displayed on Clickstay, as your bank may charge for exchanges between currencies.