square.onOrderCustomAttributeVisibleDeleted subscribes to order.custom_attribute.visible.deleted for the selected seller. It requires ORDERS_READ.
Example
automations/square-on-order-custom-attribute-visible-deleted.automation.ts
Event
A custom attribute that’s visible to your application was deleted from an order. The signal resolves to the officialSquare.OrderCustomAttributeVisibleDeletedEvent payload with type narrowed to order.custom_attribute.visible.deleted.