Hi Leo —
Very sorry for the delayed response here. Both of these failure modes arose from small bugs that have since been resolved.
I’ve just now pushed a fix for the first issue. Any users who were seeing the (regrettably cryptic!) 'API key' error message should now be able to issue their own refund successfully.
Towards the end of last week, I pushed a separate fix for the bug you were seeing manifest in the dashboard. We were not intentionally preventing you from issuing bitcoin refunds. The error wholly prevented the refunds from being created, so there’s no chance of you accidentally refunding twice as much if you submit them now.
Let me know if you have any questions about either issue.
Best,
Max