Install the “Credly Login for WordPress” plugin, and it will create an option on the standard WordPress log in page to sign in using Credly credentials.
The plugin also comes with a sidebar widget that allows users to login on the front-end of your site with either their WordPress or Credly credentials.
Credly Login also automatically integrates with the BuddyPress sidebar login where applicable.
If a user already has a WordPress account on your site, the Credly Login plugin will look for a WordPress user that has the same email address associated with their Credly account. If one is found, the Credly account will then be used to log in with that existing user account.
While this is a standalone plugin which will work on any WordPress site, it makes a great companion to BadgeOS, which empowers you to issue achievements and badges for a wide range of activity on your site.
Badges earned with BadgeOS can be automatically sent to Credly when earned, where recipients can manage and share them with other lifelong achievements. Single sign on between Credly and WordPress means your site members only need to have and remember one username and password.