From the USPS document (2014-rate-webtools-v3-v4-transition-guide.rtf)   1 RateV3 Retirement   We advise integrators currently using RateV3 to transition to RateV4 as soon as possible in preparation for the planned retirement of the API on September 28, 2014.   Corrections on how to update CC4 USPS module can be found here:   http://www.cubecartforums.org/lofiversion/index.php?t18105.html   After working with Brian Smither yesterday, we discovered a couple things to add to this topic:   Also,