Hello,

Thank you very much, Markus, for your answer.

For me a callback URL is not really needed. Actively poll the download request status may be an acceptable solution as well.

The problem is more in interactivity: as I understand, using asynchronous service does not allow us to show some kind of "progress" to the user, which seems to us convenient particularly on large downloads. Using synchronous paging service, we can show to the user the download progress.

Maybe using the call /occurrence/download/{key} iteratively we could obtain some kind of "percent of completion" information, until the request is completed?

(Sorry, I still don't tested the asynchronous service; only the synchronous one).

Thank you very much.

E. Garcia