An API User ID is needed. Go to the Web Tools API Portal - https://www.usps.com/business/web-tools-apis
Click on the Register Now button. After filling out the form, the API credentials are emailed to you immediately. The User ID has 3 numbers then 5 letters of your company name and then 4 numbers so it would look something like this - 123TESTC4567.
You have to add your USPS account in Manage Producer > Shipping > Shipping Accounts.
The Account Name is whatever you want it to be.
You must use Alternate Shipping for USPS. Set it in company advanced.
Create a Shipping method then connect the USPS account to the shipping method.
To set the service types you must have the company set to use Alternate Shipping and then click on the icon circled below.
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