TemplarRush

Correct, I was just pointing out how trivial it was to generate/counterfeit a USPS barcode. I also worked in shipping/logistics with heavy USPS integration, but it was dealing with bulk/volume labels, where we'd only get charged if the label was actually used (returns, etc).

They aren't hard to generate. They give you how to generate them via their own documentation. It's just made up of an app ID, service type code, mailer ID, serial number, and check digit.