Have you got any specific proposal about the terms of payment ?   I wonder if we can make payment for this order by documentary collection .   I'm sorry to say the only term of payment we can accept is 100 % irrevocable letter of credit payable against shipping documents .   But our order this time is very large . To open an L / C for such a large amount at a bank is costly . Can you be a bit more flexible and bend the rule a little ?   I'm afraid not . We insist on a letter of credit , because as seller , we also have the problem of funds being tied up . 