Sender-generated delivery key stable across retries of one fire. Deliberate re-emission uses a new key.
Logical notification identifier. Always equals change_id; retries and deliberate re-emissions of the same change retain it.
Resource identity copied from the corresponding account change record.
Optionalthrough_Optional advisory checkpoint at or after this change. It is a drain target, not a cursor the receiver may install without reading every intervening page.
OptionalextBounded vendor extensions subject to the same secret/PII prohibitions as the base payload.
Compact account-anchored invalidation fired after a material account change and its authoritative snapshot are readable. The payload is not current state and through_cursor is only a drain target; receivers continue from their own persisted list_account_changes cursor. Experimental in 3.2 (RFC #6810): sellers emitting this webhook MUST list account.change_feed in experimental_features.