Let's go ahead and set up Shippo together:
Add a credit card to the account here.
Add your carrier account here.
If you use one of Shippo's existing carrier accounts, make sure it is enabled on this page
If you want to connect your carrier contract, click on "Connect Carrier Account" in the top right corner and then search for your carrier.
Generate a live API key here.
Once you have your key pasted, let's go back to Rich Returns. In your dashboard, go to Integrations -> Carriers -> Shippo (Edit settings).
Paste the API Key that you just copied from the Shippo dashboard.
Head over to Configuration -> Prepaid Labels and press the Edit button that applies to the Shippo service.
Fill in your information regarding the Carrier (1), Service Rate (2), Package Dimensions (3) and the Empty Box Weight (4).
Final step but equally important: do not forget to enable the Pre-Paid Return Label (automatic). This will enable you and your customers to select the option and generate the label during the returns process.
The end. We're here if you need further assistance on this.