event name. The tables below group them by resource, which is also how the data payload is shaped.
Sub-client
Virtual account and deposits
Watch
virtual_account.deposit_funds_received rather than the account balance: it is the signal that behaves the same on every rail.
Payouts
Requests for information
The item is the unit: a request can carry several, each answered and each returned on its own. Answering one sends you nothing — your own answers are not news.
A URL with no event filter receives
rfi.* along with everything else. A URL with a filter receives it only if the filter names these events. Webhooks overview has the subscription rules.