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How to set up USPS as a shipper

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  • How to set up USPS as a shipper

    If you are having trouble, as I did, setting up USPS as a shipper on your shopping cart, it may be because you have not regestered correctly with USPS.

    In order to set up an account at USPS to install USPS as a shipper on your shopping cart, you must register onto USPS in two different places. First create a general user account at After logging on, if you are on the home page, scroll all the way to the bottom of the page. Look for "Other USPS Sites". Click on "Resources for Developers." On the "Welcome to the Web Tools API Portal" page, click on the "Register Now" bottom. Register for USPS Web Tools. Once registered, you’ll receive an email with your assigned Web Tools User ID and password. This is the ID you must enter on the Manage Shipping Rates page. You’ll then have access to the most popular APIs. Log back on with your new id information and return to the "Welcome to the Web Tools API Portal" page. Scroll down to "Easy as 1,2,3" and click on "Step 3. Permissions." Just follow the instructions.

    I have found the techs at the USPS Internet Customer Care Center very helpful, call 800.344.7779.

  • #2
    very helpful post... USPS user ID's for the API are usually formatted 123ABCDE1234 and are not your login username, which most people try to use...


    • #3
      Ok I have done all of this twice for USPS. I have added the extension. It all works except for the fact that the shipping that easy cart gives is like 2.50 above the actual cost. I have tried changing the weight, the packaging, everything. Nothing works. I want to use the live shipping, that is why I bought the premium edition. What am I doing wrong?