Getting back custom fields in JWT templates

[dougli]

It seems like there's no proper way via this library to get extra fields defined via JWT templates.

Can support be added for that? Thanks!

[gjtorikian]

I moved this request to our internal tracker, as it's a request for the API to change (you can only update the JWT template, not get anything). Since this is not specific to the Python SDK, I'm going to close the issue to keep this tracker clean. ✌️