If you've negotiated a discounted rate with USPS, then you can enter your USPS credentials in plug&paid when you activate the USPS service in your Settings so that the discounted rate appears to your buyers in the shopping cart.
Register for a USPS User ID
Register for a USPS Web Tools user ID by filling out the USPS Web Tools registration form.
When you have completed the signup process, USPS will mail you a user ID. Make a note of this, as you will need your USPS user ID to sync your USPS account with plug&paid
Your USPS Web Tools user ID is a combination of letters and numbers, for example 123ABCDE1234
, that is automatically generated by USPS.
The user ID will give you access to package tracking, rate, and service delivery standards APIs with USPS when you register.
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