50% deposit on a pro-forma invoice...100% certainty.
Many importers, whether they call themselves importers or not, have to pay a deposit on certain goods before they can secure production. The remaining balance is then due before shipment. Consider, if the rate of exchange changes minute by minute, how do you make sure that the deposit you pay is exchanged at the same rate of exchange as the subsequent balance amount you send when, as far as paying the amounts is concerned, they are sent as two separate payments? The answer is