What is the correct term for documentary credit that cannot be changed unless all parties involved first agree to the change?

Question

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The term for a documentary credit that cannot be changed unless all parties involved first agree to the change is "irrevocable." This type of credit provides a secure payment mechanism for the seller, as it ensures that payment will be received as long as the seller complies with the terms and conditions of the credit.

What Is the Correct Term for Documentary Credit That Cannot