This is a list of the event types we currently support. We will continue
to add more events moving forward. All events follow a uniform pattern -
<resource>_<event_name>. The resources that will be
present in the event content are provided beneath each event type's
description.
Note: If consolidated invoicing is enabled, the
attributes invoice.subscription_id and
credit_note.subscription_id should not be used
(as it will not be present if the invoice / credit note has lines from
multiple subscriptions). Instead to know the related subscriptions,
their line_items' subscription_id attribute should be referred.