square.onOrderFulfillmentUpdated subscribes to order.fulfillment.updated for the selected seller. It requires ORDERS_READ.
Example
automations/square-on-order-fulfillment-updated.automation.ts
Event
An OrderFulfillment was created or updated. This event is triggered when a Square product updates an order fulfillment or when a fulfillment is updated by an UpdateOrder endpoint call. The signal resolves to the officialSquare.OrderFulfillmentUpdatedEvent payload with type narrowed to order.fulfillment.updated.