Hello, I am learning the basics of the letter of credit at the moment, and I had some questions about the rules that frame it. Are the IRDG 758, ISP 98 etc... widely used or most people use only the UCP 600? I don't get exactly what the eUCP can be use for, what do the ICC call "electronic presentation"? When you are middlemen in a commodity trade, and you use a letter of credit under the rules of the UCP 600, which letter of credit should you use, Transferable L/C, Back to Back L/C, something else? Because of it's length, I think some banks might not accept the ISBP. Does some banks recognize it? Any help is appreciated!