Action Required: Re-Authorize Your USPS API Merchant Token

USPS API Is Moving to a New Version

USPS is migrating their API to a newer, improved version designed to enhance reliability and long-term support. As part of this transition, existing USPS API Merchant Tokens must be re-authorized to remain active.

If you use USPS through ShipWise, this update requires a quick action to ensure uninterrupted label generation and rating.

What You Need to Do

All USPS API account holders must re-authorize their Merchant Account directly in the ShipWise WebApp.

You can complete this in just a few minutes by following the steps below.

How to Re-Authorize Your USPS Merchant Token

1. Log in to the ShipWise WebApp
2. Navigate to Carrier Accounts settings
3. Select USPS
4. Follow the Re-Authorization Merchant Account flow to update your Merchant Token
   

Watch the Walkthrough

This short walkthrough shows exactly where to go and how to complete the re-authorization process step by step.

Why This Matters

If your USPS Merchant Token is not re-authorized:

• USPS labels may fail to generate
• Rating requests may be interrupted
• Shipments using USPS could be delayed

Re-authorizing ensures a smooth transition to the new USPS API and uninterrupted service.

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ShipWise is committed to delivering intelligent shipping solutions that simplify complex logistics for 3PLs and high-volume e-commerce shippers. With each update, we help you ship smarter, faster, and more profitably.

Need help exploring what's new?
📧 support@shipwise.com
💬 Check out the New ShipWise Community Forum
📞 Or schedule a time with your Account Manager

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