The document provides an overview of how letters of credit work, including:
1) A letter of credit is a bank's undertaking to pay a beneficiary a specified amount upon presentation of documents according to the credit's terms.
2) In theory, letters of credit involve 3 independent contracts between the buyer/seller and their banks, but in practice often include advising/nominated banks.
3) The seller presents documents to their bank and receives payment, while the buyer's bank reimburses the paying bank and debits the buyer.