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USPS Hold for Pickup API - Sample Source Code

The U.S. Postal Service provides a suite of USPS Web Tools that customers may integrate into their own websites to validate or find mailing addresses, track and confirm mail delivery, calculate shipping rates, and create domestic or international shipping labels. This service allows an application to find a postal facility where Hold for Pickup service is offered, and to create Hold for Pickup labels for Express, Priority, or First Class mail.