All about Uniform Customs and Practice for Documentary Credits (UCP)

A Documentary Letter of Credit or LC is an irrevocable, written undertaking by a commercial bank, issued at the request of the buyer (applicant) in favor of the seller (the beneficiary), to the effect that payment for certain goods or services will be made against a complying presentation of documents.

source https://www.caclubindia.com/articles/uniform-customs-and-practice-for-documentary-credits-ucp-46795.asp