https://postalpro.usps.com/2722/rss.xmlMerchant Returns API Postsen https://postalpro.usps.com/merchant-returns-api/user-guide This user guide provides examples of XML transactions to the USPS Merchant Returns web service and guidance for installation. Wed, 18 Oct 2023 00:00:00 -0400 https://postalpro.usps.com/merchant-returns-api/user-guide This user guide provides examples of XML transactions to the USPS Merchant Returns web service and guidance for installation. Wed, 18 Oct 2023 00:00:00 -0400