It should not repeat or contradict what you have already said in the main body of your letter, nor should it introduce new topics or issues that require further explanation or discussion. To write a postscript, begin with P.S. followed by a space and a dash, and then write your message.
How to Write a Letter of Credit Prepare the letter of credit documents, including the credit application, bank instructions, and the credit agreement. Make sure all documents are signed, dated, and include all necessary information. Submit documents to the issuing bank. Confirm that the bank has accepted the documents.