> Because these businesses have to register as CMRAs and you have to sign a notarized form for them to legally receive mail for you, some services will still detect it and not let you use the address
That's exposed in the USPS API for address validation. Which the USPS is starting to charge for access. Everyone doing address validation in the US eventually uses that service (sometimes through a go-between).
That's exposed in the USPS API for address validation. Which the USPS is starting to charge for access. Everyone doing address validation in the US eventually uses that service (sometimes through a go-between).
https://developers.usps.com/addressesv3