A more secure method of insuring payment is by documentary letter of credit issued by the buyer's bank at request of the buyer. When the buyer and the seller have agreed on a sales contact / the buyer instructs his bank in his country to issue a letter of credit / in favor of the exporter. This bank / which issues the letter of credit / is known as the issue bank advising bank. The issuing bank then asks a bank in the exporter's country to advice the credit to the exporter. This bank is known as the advising bank. The cost of issuing a letter of credit is usually borne by the buyer