How does this look? I'm not certain I understood the sentences in boldface.
We regret that we are unable to accept your terms of 20% advance payment by T/T before mass production with 80% balance payment by letter of credit.
The letters of credit we issued are irrevocable. They cannot be amended or canceled without prior agreement with the beneficiary, the issuing bank and the confirming bank (if any), and they are based on UPC 600 terms.
The cargo receipt is requested by the issuing bank to confirm the signature of the applicant. Is this explanation clear? Please review the details, and contact us again if there are still any problems.
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