I recently rebuilt my microsaas Loginllama. It uses the same stack but I've made the API much much better and it's now a product I'm happy to promote.
As with most developers I hide behind building instead of marketing.
As this a developer focused product, this is me marketing! It's a product built in anger for myself when I had to implement a similar system for a number of clients. I released it as I assume that other people had the same problem.
There are SDK's available for Nodejs, PHP and Python. Auth0 and Wordpress integrations are coming soon.
Let me know what you think and if this is a product you would like/want to us. Any feedback is helpful.