This just in from USPS. I'm still trying to determine whether this will affect rate-only gathering of information that is used by the shipping module.

On Wednesday May 15, 2024, the United States Postal Service will perform maintenance that is critical to its infrastructure.

USPS API Platform
Scheduled Deployment Event
Deployment Window
Schedule Date Time
Start Wednesday, May 15, 2024 8:00PM CT
End Wednesday, May 15, 2024 11:00PM CT
Impacted System Outage
USPS API Platform & CNSv2
 Yes


IMPACT: Existing client application access and payment authorization tokens will no longer be valid and will result in an error response if utilized. It is necessary for all customers to regenerate their tokens immediately following the change.

ACTION: Client applications must obtain new access and payment authorization tokens.

Note: Detail Release Notes to be provided prior to the release.

We apologize for any inconvenience. Direct any inquiries or concerns to API Support via eMail at apisupport AT usps DOT gov