Hi,
When trying to upgrade to subscription, I get an internal server error, I used stripe on many other site, and tested from 2 browser, did you notice less registration recently? 
Error is 500, server error…
Sorry about that! You likely hit us right after we rolled out a new Stripe integration on June 8; a couple of bugs in the upgrade endpoint returned 500s for existing accounts and were fixed on June 11. Could you try again and let me know if you still run into an issue? It’s possible it’s something unique to your scenario, haven’t seen a dropoff since a few fixes in June 