Well , we've settled the problems of price , quality and quantity . What mode of payment do you wish to employ ?   Irrevocable letter of credit , of course . It's the normal terms of payment in international business .   Could you adopt D / A or D / P ? You see I have to pay a deposit when I open a letter of credit . That will tie up my funds and add to the cost of my imports , especially for such a huge order . 