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USPS to verify address?

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USPS to verify address?
How many of you use the USPS web page/db to verify addresses?

Do you do it on the "front end" (via website) or do you do it on the "back end" (via API) ?

What has been your experience?
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Re: [Watts] USPS to verify address? In reply to
In the same vein... Does anyone use Ajax?

I'm thinking about using Ajax to check addresses that users enter into a form. Currently they have to click a button that triggers a pop-up window, but I'd love to make it a bit more "idiot proof" by having it happen asynchronously.

Does anyone have any opinions on the matter?

Just curious.