Setting up ELEX USPS Shipping Method for WooCommerce(Basic) plugin

I am new to Word Press and am trying to set up my store.
In trying to set up the USPS shipping plugin the documentation referred me to USPS. Instructions provide at USPS directed me to e-mail them for instructions on set-up. In writing to them I received the following response. Any information on set-up would be appreciated.

USPS API Support

From:
[email protected]
To:
[email protected]

Fri, Mar 28 at 4:54 AM

Thank you for reaching out.

Unfortunately, your software provider has given you a link for setup that is no longer valid, indicating that their integration is running on outdated technology. Before you can proceed, they will need to update their USPS integration. Please have your software provider contact us through API Support to request assistance with their cloud migration.

When researching whether a software is properly integrated with the USPS, look for indications such as a reference to the USPS Cloud or Hybrid environment, directions for users to create their accounts on developers.usps.com or the Developers Portal, or documentation indicating that they're calling the endpoints at apis.usps.com.

Please let us know if you need additional assistance.

Thank you,

Frankie | USPS API Support

[email protected]

475 L’Enfant Plaza SW

Washington, DC 20260

From: [email protected] [email protected]
Sent: Tuesday, March 25, 2025 12:16 AM
To: USPS API Support [email protected]
Subject: [EXTERNAL] Webform: On-Prem App Request

CAUTION: This email originated from outside USPS. STOP and CONSIDER before responding, clicking on links, or opening attachments.

Submitted on March 25, 2025

Submitted by: kkcollectables

Submitted values are:

Company Name
kkcollectables

Software Vendor
ELEX USPS Shipping Method for WooCommerce

Instructions Provided by the Software Vendor
Step 1: Register for a USPS Web Tools Account
Go to the USPS Web Tools registration page.
Fill out the required information to create an account.
Once registered, you will receive an email with your USPS Web Tools User ID.
Step 2: Get USPS API Credentials
After registration, log in to the USPS Web Tools website.
Navigate to the API documentation and find the credentials. Please follow the attached list of credentials required for integration
Please follow the steps provided by USPS to get the credentials.
Once you have your credentials you need to request access to API by following the below link.
If you still have any issues in getting the access or credentials then you can directly email to USPS.([email protected])

Mandatory to Get Rates:
Client id:
Client secret:
Mandatory to generate labels:
CRID:
MID:
Manifest MID:
Account Number:
Optional:
AESITN:
Invoice Number:
License Number:
Certificate Number:

Step 3: Install and Activate ELEX WooCommerce USPS Shipping Plugin

Go to your WordPress dashboard.
Navigate to Plugins > Add New.
Search for “ELEX WooCommerce USPS Shipping Plugin.”
Install and activate the plugin.

Step 4: Configure the Plugin with USPS API Credentials

Once the plugin is activated, go to WooCommerce > Settings > Shipping > ELEX USPS.
Click on the General Settings tab.
Enter your USPS API 3 credentials (Client id and Client Secret) in the appropriate field.
Configure other settings as needed, such as the origin postcode, debug mode, and other preferences.
Now go to the Label Generation tab and enter the additional credentials for “Label Generation” along with the mandatory fields.
usps api 3
usps api 3

Step 5: Test the Integration
After entering the API credentials, you can test the integration by placing a test order.
Go through the checkout process and ensure that USPS shipping rates are being calculated correctly and you are able to generate the shipping label.

What USPS services and/or information would you like to access through this Software Vendor or Plug-In? (e.g., rate shopping, label generation, address validation, etc.)
real-time shipping rates, label generation, shipment tracking, and box packing facilities.