"PB Shipping API 1000033 Unauthorized API Access for Given Credentials" message in SendPro Enterprise
Learn how to resolve the message "PB Shipping API 1000033 Unauthorized API Access for Given Credentials" in SendPro Enterprise.
Products affected: SendPro® Enterprise
Issue
When voiding a PB Shipping API label, the message "PB Shipping API 1000033 Unauthorized API Access for Given Credentials" is displayed.
Cause
Due to the funding resource, voiding is not supported by the carrier.
Resolution
To receive a refund please follow the Requesting a USPS refund in SendPro Enterprise steps.
UPDATED: May 05, 2026