answer: #Person2#'s customers demand that 80% of the credit amount be paid at sight and the rest be paid after, but #Person1# asks for full payment at sight and sends fitters to ensure machines' efficiency. #Person2# agrees.
documents: #Person1#: What arrangement will you make about payment?
  #Person2#: We shall open an irrevocable L / C to cover our shipment from Shanghai to Hamburg. Is it at sight or after sight?
  #Person1#: At sight of course.
  #Person2#: Some customers demand that 80 % of the credit amount be paid at sight, and the rest be paid after the machines are proved satisfactory on trial.
  #Person1#: I am afraid that can't be done. We have never done business on such terms.
  #Person2#: But such terms are quite common in the machinery trade. Other suppliers are offering better terms. Some even allow payment 60days after sight.
  #Person1#: We ask for full payment at sight, because we guarantee 90 % mechanical efficiency for all our products. You don't have the same guarantee from other suppliers. The usual percentage is around 85.
  #Person2#: That's true. I'm eager to know if you could send some fitters to ensure good operation.
  #Person1#: Yes. We usually send technicians abroad to offer after-sales service to our customers.
  #Person2#: If you send fitters along with the machines to ensure that all the machines run properly, and if you provide after-sales service, we agree to make the payment in full.
  #Person1#: Thank you. I am glad we have come to an agreement at last.