I quote from the Curve blog of 6th August 2020:
“If you have a refund sitting in your Curve Cash card right now, you can spend it immediately but can’t move it to another card just yet. We’re working on making this possible very soon, and will update you as soon as it is.”
Three months on and no news.
I had a partial refund credited back to Curve Cash (not sure why it couldn’t be returned to the underlying card but that’s not the point I’m making) and it’s now stuck there (most transactions are larger than the refund).
Come on Curve, you need to keep your promises!