How can I get the X-External-Context-ID if I want to send the PUT request update and issuance of an import letter of credit?
There is no description for that field that we need to pass in the header and it's also the required field.
An encoded string that contains the details of an ILC issuance transaction that is waiting for a response from the external system. This field is only supplied in the ILC Events API where the user must subscribe to.