The USPS label creator feature will automatically create a PDF shipping label for the seller when a product with the shipping method as USPS, is purchased. The PDF label is located in the Transactions > Seller section of the user dashboard:
The USPS shipping label is generated by EasyPost which is the API that we have integrated that connects to and calculates USPS pricing. The marketplace owner is charged for the shipping label per USPS postage label pricing.
If you are interested in this feature and want to learn more please hit submit a request at the bottom of this page.