Configuring an Authentication Provider for LinkedIn Social Media Accounts allows UC to use LinkedIn as an external identity provider for its customer community. This means that customers can use their LinkedIn credentials to log in to the community without storing their credentials in Salesforce. Creating a Custom Apex Registration Handler allows UC to customize how new and existing users are handled when they log in with an external identity provider. This means that UC can control howuser records are created, updated, or matched when customers use their social media credentials to authenticate to the community. These two actions can meetthe requirement of UC to use social media credentials for its customer community.