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How to open L/C back to back and keep the details secret? - l&c shipping lines

I want to do later as a mediator Internatinal! my buyers and sellers in the country, the various health care and I am in the 3rd Country.
and mine is bigfoot How can I add the information and data will, in my Secert Seller my buyers. each seller sends the product details on the shipping documents and invoices and packing list.
Please, please help me Geting Useful information is complete and I can do this job