Is there any way to export code from the free plan?
Or pay one-time fee?
No such feature. You can upgrade to the starter plan, export, then try to contact support for a refund but no guarantees.
You can pay a one time fee of one month of $24 and export code for one month before canceliing the $24 Lite plan. I wouldn’t count on exporting then ask for a refund, that’s not really the spirit of the model here…