Hi again,
Thanks for the info! It's clearer now what's going on. I guess I misunderstood what x-callback-url is, I thought it was what allows you to send these url callback type messages between apps in the first place, but apparently it's more of a standard for how to format these messages in a uniform way. I need to read up a bit on the Pythonista URL scheme to see if I can parse out the ?code=XXX in a good way.
Cheers,
Christian