Bureaux de change exchange one currency for another, most commonly helping travellers obtain foreign cash before a trip or convert unused currency after returning. They typically buy and sell banknotes in a range of currencies, with availability depending on demand. Customers may be able to request particular denominations, such as smaller notes for everyday spending, and some providers can order currencies that are not held in stock. Services and procedures vary between businesses. Some offer transactions at a counter, while others allow customers to reserve currency for collection or arrange delivery. Exchange rates and any fees or commission affect the amount received, and the rate may differ from those used for card payments or cash withdrawals abroad. Staff can explain the currencies available and the identification or payment details needed to complete a transaction.