We just recently had a client who is adding United States Postal Service (USPS) to their shipping options in their Miva store. She went and registered for an account at USPS and gave us the information we needed to plug in to the Miva Module, we tested it, and NO Love. Come to find out, she had registered at the wrong place. In order to use USPS with Miva or any online store, you must first go and register for the USPS web tools which you can find here: https://secure.shippingapis.com/registration/
Once this is complete, USPS will send you an email which DOES require action on your part to verify. They will then let you utilize their test server to calculate shipping costs, etc.
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