I have never got it working. in previous edition v154 and beyond, we did flat rate. I would like to get this working. I read the other versions post but it does not work for v157c with K11. If someone got it to work in previous versions of USPS maybe they can let you know. The code I read before used a master category number for Media (mine is Master_id = 5) for loop but that did not work on my K11.
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