You need USPS API
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Be aware you need to contact USPS to get an API. You have to go to the USPS page and scroll down and you’ll see a small link that says legacy API, register, then send an email to USPS to request your application status for approval which takes a few days. They’ll prompt you for additional information and then after a couple days, you may get approved as long as you provided all of the necessary information.
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