|Starting on Sunday, July 28, the United States Postal Service will roll out changes to their API that will impact your ability to offer Priority and Express mail shipping options. USPS is changing the name of those two shipping methods and their Webtools API is being updated to match those changes.
To continue utilizing USPS Priority AND Express mail methods, merchants on Magento Enterprise Edition must install the patch we¹ve created to address the issue.
If your merchants are on Magento Enterprise Edition 1.12 or 1.13, download the patch here and use the installation instructions at the bottom of this email.
If your merchants are on earlier versions, patches and instructions will be available on Monday, July 29, and we will send out an email with download information.
Please note that you will need to wait to install this patch until July 28, after the USPS has made the change to their API.
For more information, here is the official statement from USPS: