Is it possible to dynamically populate the custom_invoice_url with parameter values
example
https://example.com/invoice123456.pdf?packing_note={{packing_note}}
where {{packing_note}} would be urlencoded for the current value in packing note like this%20is%20a%20note
the goal is to make a dynamically generated custom invoice that would incorporate all notes.
the challenge is that at order creation, there may be no notes, but they may be added afterward.
Instead of having to query for changes to notes all the time, it would be cleanest to create the custom_invoice_url at order creation, then populate parameters for it at print time.