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