kit.onSubscriberCustomFieldValueUpdated subscribes when a subscriber custom field value changes.
automations/on-subscriber-custom-field-value-updated.automation.ts
Event
data contains subscriber and customField, including the new value. Provider snake case fields are exposed as camelCase. Subscriber custom-field keys under fields are preserved exactly.
Automate.ax creates and maintains one account-level Kit webhook endpoint, verifies the timestamped X-Kit-Signature against the raw body, and deduplicates each event by id. Kit can batch up to 100 same-type events in one delivery; each event starts independently. Use kit.onEvent when one automation should receive every available event.