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kit.onCustomFieldCreated subscribes when a custom field is created.
automations/on-custom-field-created.automation.ts

Event

data.customField contains the field. 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.