USPS is the official mail carrier for the United States. USPS mainly ships from within the United States addresses (from and to). You can obtain access to USPS web tools by applying here. The following fields are required:
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Consumer key
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Consumer secret
Login to USPS Developer using your USPS business account. Create an App. Give it any name and make sure to select the "Public Access" api.
Once your app is created, copy the consumer key and secret to enter into the Storefront.
See Getting Started instructions for more information.
If you have a test account and you need help to take your account to production mode, you can tell USPS that you have completed the testing required for production mode. Simply email uspstechnicalsupport@mailps.custhelp.com with the subject heading "Please move User ID xxxxxx to the production server". Alternatively, you can follow the contact instructions in the USPS email sent to you during your registration. You may also try contacting USPS Internet Customer Care Center directly over the phone at 1-800-344-7779 Opt. 3