This letter is written for a third party who authorises to have a right to the amount of letter of credit as per the request by the revolving letter of credit pdf. This letter is a means of contacting the third party client and requesting them to finish the transaction as approved in the contract that both parties have done at times. Write everything in brief, the amount, the mode of payment etc.
Do not write a lengthy letter. A short and sweet letter actually makes a difference. Use a professional language as the letter is an official one.
Use all the technical terms those are required to be used. Do not make use of a very simple language.