I can successfully test API calls from the command line on my server, however, when testing (from Stripe's dashboard) the Webhook URL that's generated by the plugin, I keep getting: "Test webhook error 500".
I realize it's likely me doing something wrong. Sadly, I'm new to Stripe and your plugin. I've left the plugin in 'Test' mode as my Stripe account is currently in Test mode. I've also provided the Test Published key (not the Live). Do I need to 'register an application' on Stripe's end?