Once again, domestic first-class mail has changed. It apparently wasn't working today due to today's USPS changes. I discovered this by chance. And after tracking down the issue for about 20 minutes, I figured out how to fix it. Apparently "First-Class Mail Parcel" is now "First Class Package - Retail." You'd think they would email the changes to those signed up to use their API service, but I guess that's too much trouble. Anyway, it's working now. Note that this did not affect any other USPS shipping methods. |