I wonder how that's handled now... last I hear the USPS had a database on CD-ROM you could get. Wonder if its api based now? We used to run 'zip correct' jobs

I wonder how that's handled now... last I hear the USPS had a database on CD-ROM you could get. Wonder if its api based now? We used to run 'zip correct' jobs for large merchants at the service bureau I worked at just out of high school. Just 'correcting' thousands/millions of addresses at a time.