Enoki
SOC-14 1K
It's pretty much the traditional letter of credit.
The difference would be that once it's issued, for the next general data dump, the particulars and the codes of it would be spread to all the branches, and chances are that the information will arrive before you do. When you draw on it, that information will be spread to the other branches again, which will allow each branch manager an uptodate status on your remaining funds.
What happens when you go to, say some TL 4 world off the X-boat routes...?