The Irrevocable Letter of Credit must be signed by an officer of the financial institution.
FROM :( NAME & ADDRESS OF OPENING BANK) TO :( NAME & ADDRESS OF NEGOTIATING BANK) 40A TYPE OF L/C: IRREVOCABLE. 20 L/C Number.
While the content of the letter will change depending on your situation, there are a few important aspects to include: Provide all details the best you can, including correct dates and dollar amounts. Explain how and when all situations were resolved. Detail why problems won't happen again.