Create a "user" node on Aura when a new user signup to our application

When users sign up to our app, we create a new "user" node in our graph database. Multiple users/clients are in the same database.

We currently use the http api to create/update the "user" node because we can't install the neo4j driver on auth0.

On Aura the http api does not exist, what are the alternative to cover the problem?
Would it be suitable to use a lambda function for example?

Thanks for you feedback