How to get API Key:

To register for a USPS user ID, fill out the USPS Web Tools API Portal registration form on the USPS site, which looks like the below screenshot for your reference.

Once the form is submitted, The user ID will be sent to your registered email address, and then you can validate that user ID on our app to link your USPS account to our app.

Once the user ID is validated successfully in our app, you can choose your preferred shipping services, and you will be able to see the rates from USPS on the checkout page.