USPS API Direct Integration

API

Description of Service

The USPS API Direct integration is a direct connection between ShipWise and USPS that enables:

Postage service provided by the United States Post Office
Access to ShipWise discounted USPS rates
Real-time label generation provided by the carrier's API server
Improved reliability and control over USPS shipping workflows
A streamlined connection without reliance on legacy postage providers

This integration is required for customers who want to use USPS services within ShipWise while maintaining discounted rate access.

ShipWise’s implementation team works directly with customers to configure this integration and ensure all shipping operations continue without interruption.

How to Set Up a USPS Account

To begin using USPS API Direct, customers must first create and configure a USPS account through the USPS Business Customer Gateway.

This walkthrough will guide you through:

Creating a USPS account
Setting up your Business Customer Gateway (BCG) access
Completing identity verification
Configuring your USPS payment account

Onboarding Troubleshooting

Some customers may experience issues during USPS account setup. These typically occur within USPS systems and require direct assistance from USPS support.

Common Issues

Delayed or missing verification emails
Issues receiving MFA (multi-factor authentication) codes
Errors accessing the USPS Business Customer Gateway (BCG)
Inability to proceed after initial account setup
Fraud or account restriction errors

How to Resolve USPS Setup Issues

If you encounter any of the issues above, contact USPS support:
📞 USPS MSSC Support: 1-877-672-0007

The MSSC team can assist with:

Account verification
Login and access issues
Fraud-related errors
Payment account setup problems

Additional Notes for Troubleshooting

Refreshing the browser or restarting the setup flow may resolve minor issues
Ensure all required fields are completed during USPS registration
Use a consistent email address throughout the setup process

Sample USPS Labels

Below are examples of USPS labels generated through the USPS API Direct integration. These labels are provided by the carrier's API server and reflect real-time USPS rate and service selection.

P01 - Ground Advantage