We have just released a new PLUGIN that will validate/verify an address against the USPS (United States Postal Service) address database. The plugin provides an ACTION that can be used to send your address fields (Street Address, Apt/Unit, City, State, Zip5, and Zip4) to the USPS address database, and the database will return the correct/complete address.
This plugin requires a USPS username, which can be obtained very easily for free via the USPS website.
Use this link: USPS REGISTRATION (Get your USERNAME and PASSWORD here)
Also, there is a DEMO page that DOES NOT require you to sign up with the USPS: https://usps-address-validation.bubbleapps.io
Instructions are also provided on the DEMO site, or you can use this link: https://usps-address-validation.bubbleapps.io/instructions
