1. Fill out the form below, located at https://secure.shippingapis.com/registration/

2. You will receive an e-mail with your USPS Webtools ID. Copy the Username into your clipboard.

3. Paste your Username into the USPS Webtools ID box. It is located under Settings -> Shipping.

4. At the bottom of the page, press Save Settings.

5. Call USPS at phone number 1-800-344-7779. Tell them you are calling to get your Webtools ID activated for a 3rd party company and that you need production access. They will ask you for the User ID you recieved in the e-mail after signing up. It will take 2-3 minutes for it to be activated.

To Set up Payment for USPS Labels, you must have a Stamps.com account. Follow the steps from this guide to set one up.