SLOTS
SLOTS = 5
Subscriptions the form renders.
Fixed rather than unlimited, because a site needing more than this is integrating through something other than a settings form.
The endpoints that are told when something happens.
A secret already stored is never rendered back into the form. A configuration form that showed the current value would put every subscription's signing secret into the HTML of a page, into the browser's cache and into any proxy in between. So the field is left blank with a note that it is set, and an empty submission keeps what is there rather than clearing it - which means clearing a secret deliberately needs its own control.
The event list comes from StrataEvents::all(), so an event added in a later release appears here
without this form being edited.