title: How to test USPS shippings
body: <p>I use NopCommerce web store and work on implementing USPS shippings.</p>
  
  <p>I registered on USPS service and got email with username, password and testing URL. I called USPS service to switch to production server but they said I need 2 successfully tests.</p>
  
  <p>When I try to test it via NopCommerce (I set up testing url from email) it says: </p>
  
  <blockquote>
    <p>USPS Error returned: Error Desc: API Authorization failure. RateV3 is not a valid API name for this protocol. </p>
  </blockquote>
  
  <p>Who can help me to do integrate? </p>