Function: Whether the passed ticket provider class string (or its slug) is active.
Filter Hook: Allow filtering the relationships so providers can add their own strings.
Method: Get the Provider class name from its slug.
Method: Return the string representation of this provider class as the class name for backwards compatibility.
Method: Given a post ID, get the instance of the saved or default ticket provider class.
Method: Given a ticket provider, get its Attendee Optout Meta Key from its class property (or constant if legacy).
Method: Whether a post has tickets from this provider, even if this provider is not the default provider.
Method: Binds and sets up implementations.
Method: Handle accent color customizations for Event Tickets.
Class: Class Customizer.