It cannot be understood that your time limit is 30 days after sight or 30 days after bill of lading or other. If the payment is made 30 days after sight, it means that the issuing bank will pay 30 days after receiving the documents. If it is 30 days after the bill of lading or other documents, it will be paid to you 30 days after the date of these documents. For example, if it is 30 days after the bill of lading, it means that the issuing bank will pay 30 days after the bill of lading is shipped. Your discount is between you and the negotiating bank. If you want to discount, it is equivalent to borrowing from the bank. The mortgage is your certificate, and you need to pay the discount fee and interest to the bank. Interest is calculated on a daily basis.