How do you get tracking and delivery events in to Shopify when it closes the order as soon as the fi

[IGIT]

How do you get tracking and delivery events in to Shopify when it closes the order as soon as the first event is received?

We send in a fulfil event with a status of in_transit. Shopify notifies the customer with an in transit email and promptly closes the fulfilment, so no further updates can be issued. We can't send in a simple fulfilEvent as this requires a fulfilment ID. Also, no attempt to call the fulfilEvent REST API returns anything but NOT FOUND.

This seems to work in the US, delivery, out for delivery updates seem to get to the customer, but not the rest of the world.

Any help would be much appreciated.