Email just received from USPS:
Web Tools customers;
Effective August 24, 2011, the “Rate” and “RateV2” versions of the Web Tools Domestic Rate Calculator APIs will be retired. Integrators are encouraged to migrate to “RateV4” as soon as possible. You can find the “RateV4” technical guide at
www.usps.com/webtools/technical.htm.
For questions or concerns, please contact the USPS Internet Customer Care Center at 1-800-344-7779 or
icustomercare@usps.com.
Thank you,
USPS Web Tools Program Office
Sorry if this has been asked before but couldn't find it. What is required to update sites running RTShipping to work with RateV4?