Workflows can use app permissions
Allow workflows to read from and to write to all items in this site.
SharePoint 2013
Feature Details
ec918931-c874-4033-bd09-4f36b2e31fef
Web
False
True
False
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\Template\Features\WorkflowAppOnlyPolicyManager
Microsoft.SharePoint.WorkflowServices.SPAppOnlyPolicyManagerFeatureReceiver, Microsoft.SharePoint.WorkflowServices, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c