Requirements: Run your site with public access and HTTPS (use ngrok or similar). One account set up on https://badgr.com/ .  Testing scenario: Login as admin Go to "Site administration > Server > OAuth 2 services" Create an "Open Badges" service with the following information: Name: Badgr Service base URL: https://badgr.com/ Go to "Site administration > Badges > Manage backpacks" Create a new backpack with the following information: Backpack API: https://badgr.com Backpack URL: https://badgr.com API version supported: Open Badges v2.1 OAuth 2 services: Badgr Create a badge, publish it and award it to the admin user. Go to the user preferences page. Access to "Backpack settings". Select "https://badgr.com" from the list and connect using a valid user account in Badgr.com. Make sure the email for this user in Moodle is different to the one used to create the account in Badgr.com. Go to the user profile page and access the badge you've been awarded. Click the "Add to backpack" button. Check the following error is displayed: "Can't export the badge "<BADGE NAME>" to backpack. Error: VERIFY_RECIPIENT_IDENTIFIERThe recipient does not match any of your verified emails..."