By eHow Business Editor
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Letters of credit are parts of agreements between two parties, a buyer and a seller. These are commonly used when a product is exported to another country. Government offices also rely on letters of credit from developers or other commercial parties. A letter of credit is basically to safeguard the interests of both the buyer and the seller; a letter of credit establishes a payment to be made by the buyer's bank to the seller if, and only if, certain documents are presented to that bank. Handling a letter of credit, like other abstract financial transactions, requires professionalism and attention to detail.