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.
You will then need to log in to MIVA, click shipping settings, check the box next to USPS Online Rate Calculation (Domestic & International) click update, then select the tab at the top that says USPS. You will then see this screen where you need to enter the account info that USPS provided you with. The URL to USPS Web Tools Server should already be populated for you.
The USPS Shipping Module
Click submit and go test in your Miva store. That should do it.
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