How do I integrate my Store with USPS for Real-Time Shipping Calculation?

Your 3dcart store can be integrated with the main shipping carriers in order to provide your customers with real-time shipping calculations for their orders.

This guide will show you how to set up your account registrations with USPS and then integrate your credentials to your 3dcart store.

Register with USPS

To register your USPS account, please follow these steps:

  1. Go to the USPS Web Tools Registration form located here.
  2. Fill out the form as required

After submitting the form, USPS will create your API login account. You will then receive an email with your API account credentials.

These API credentials will need to be entered in your 3dcart Store. However, you will first need to be moved onto USPS’ Production API environment.

Adding your credentials to your 3dcart Store

Once you have registered and have been moved to the Production API servers for USPS Web Tools, proceed with the following steps to integrate them into your 3dcart Store.

  • Log into your 3dcart Online Store Manager
  • Using the left hand navigation menu, go to Settings ->Shipping
  • Click on the “Enter Settings” button located under Shipping Settings
  • Next to the USPS section, click on “Enter Credentials”
  • Enter your USPS API credentials in the provided fields
  • Click “Save Settings” at the bottom of the page.

You are done integrating your Store to USPS and can now use Real-Time Shipping Calculation for USPS shipping methods.

Please review our additional article on setting up the Shipping Methods