When shipping with the USPS, generate labels via postmen and enjoy lower shipping rates. Separate credentials from the USPS courier side are not required. Add your credit card details and you are good to go. You can create a Shipper account for Sandbox and Production.

🔧 Add Postmen shipper account

Login to Postmen > Shipper accounts > Add new > USPS
Enter required details > Submit

Canceled or unused labels will be refunded within 4 weeks. Feel free to contact us in case of any queries.