Why can't you normalize the third-party address and then normalize yours?
That should give you the necessary match.
That should give you the necessary match.
Also, address correction doesn't know anything about people's names, business names, etc. Sometimes you need those to disambiguate.
The best change I made was having them first enter zip code, then pick city/state from a list that goes with that zip code. Both Google and the USPS have apis for that mapping.
Also, fun fact: UPS charges me $15 if they have to make an address correction at delivery time. So, for example, if a customer fails to put a Suite number in, and the UPS software doesn't tell me it's missing, UPS charges me $15. I've complained that I shouldn't have to pay when their software fails. They don't care. Argh!