A few simple steps that will help you set up your EasyPost integration with Rich Returns:
Head over to the EasyPost where you can sign up: https://www.easypost.com/signup
Add your own carrier-account or select one of EasyPost's existing carrier-accounts here once you have signed up: https://www.easypost.com/account/carriers
You can find your EasyPost API Key here, look for the 'Production API key': https://www.easypost.com/account/api-keys
Once you have your API Key, head over to your Rich Returns Dashboard. Next stop: Return Settings -> General -> Return Methods -> Pre-Paid Return Label (automatic) -> Configure.
4. Select EasyPost as your Shipping Platform and place your API Key under the API Key field. Please note that EasyPost requires the 'Production API Key' you can find here in your EasyPost account. The 'Test API Key' will not work. Please make sure to adjust your settings accordingly, such as the rate you are going to use or simply clicking 'Choose cheapest rate'.
Voila! Easy as 1,2,3...4.