Can I authenticate a session in a NodeJS serverless function when I'm using Auth0 Passwordless on my front end?

[dan.woda]

You must request a token for your API.

Why is my access token not a JWT? (Opaque Token)

Question: Why is my access token not a JWT? (Opaque Token) Answer: An access token will be issued in one of the following formats: JSON Web Token (JWT) : Tokens that conform to the JSON Web Token standard and contain information about an entity in the form of claims. They are self-contained in that it is not necessary for the recipient to call a server to validate the token. Access Tokens issued for the Auth0 Management API and Access Tokens issued for any custom API that you have registere…

edit: this may also be helpful

https://auth0.com/docs/tokens/guides/get-access-tokens