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USPS Electronic Merchandise Return Service API MASTER RECORD

[Editor's Note: This API profile is a dupe of the USPS Merchandise Return Label API profile.] The U.S. Postal Service provides a suite of USPS Web Tools that can be used to validate or find mailing addresses, track and confirm mail delivery, calculate shipping rates, and create domestic or international shipping labels. With this the Electronic Merchandise Return Service API, senders can generate merchandise return labels to make package returns simpler for recipients.