1. Go to https://developer.ups.com/.
2. Click Create an Application
Tip - If you aren’t already logged in, log in to your existing account or create a new account. After logging in or signing up, you will be redirected away from the developer site. Return to it by going to https://developer.ups.com/ and clicking Create an Application again (as described above).
3. Click Add Apps.
4. On the next screen, select I want to integrate UPS technology into my business and the UPS account you want to associate with the app. Then click Next.
5. Fill out the contact details and click Next.
6. Enter a name for your app (e.g. UPS Shipping Method for WooCommerce).
7. Search for and add the Authorization (OAuth) and Rating products, then click Save
9. In your WooCommerce store admin area, go to WooCommerce > Settings > Fulfillment > UPS and input the following settings: