Improves every step of creating, tracking and managing USPS Certified Mail,®
whether you are sending one, 100 or 100,000 pieces.

Welcome Developers!

If you're a software developer, we've made it quite simple for you to integrate into your own application. Just review the four Application Programming Interfaces (API) options below and then complete the form that follows. A representative from our Developer Group will contact you shortly.

  1. Web Service. A requesting application sends all of the details of a single USPS Certified Mail® label to through an HTTPS web service (SOAP). The label image is returned in real-time.
  2. Outsourced Printing. An extension of the web service interface, document data is routed into a pre-determined page template and then printed and mailed from approved processing facilities.
  3. Batch Processing. An XML document containing the details of a batch of labels is transmitted to via SFTP. After generates the USPS Certified Mail® labels as images, a ZIP file of the images is sent back to the requesting application through a pre-arranged SFTP server.
  4. Weblink. A requesting application connects users from their GUI to the Web GUI with a link. The link can optionally contain (via POST data) details of the label to be generated. With the GUI, the user confirms the data required on the USPS Certified Mail® label, then previews and prints the USPS Certified Mail® label.

For each of these interfaces, the user of your system also needs to have an account with, consisting of an: Account Name, Username and Password. The labels that are generated become "accountable documents", and your users will be able to log into directly to check on their delivery status.

To work with, you will need a partner key and test account from our Development Team. Please contact Developer Support using the form on this page and we will get back to you quickly.

Contact information:

Which of the four APIs are you most interested in learning about (click as many as you want):

Web Services

Outsourced Printing

Batch Processing

Weblink LLC is a BBB Accredited Computer Software Service in Cary, NC

Our Innovations

For a review of the innovations has brought to Certified Mail, download our PDF brochure.

The Buzz...

“ helps us create USPS Certified Mail® labels with postage and addressee in under 30 seconds. Our regular USPS mail carrier picks up our items, so our people don't travel and wait at the Post Office. The prompt return of the Return Receipt (Electronic) helps us move forward to the next step in our Affidavit of Service and saves 3-5 business days.”

– P.W.
Managing Partner, Law Firm

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