Following up @stimpack, after checking with one of our senior engineers a possible way would be to likely use Moltin’s client credential token and perform calls to the Moltin API from a back-end you control.
The above would allow to authenticate through auth0 normally and then just use that Moltin token to manage the Moltin part of the equation. It’s important to note that this implies you have your own back-end.
I hope this helps shed some light on the path forward @stimpack. Thanks!