Do you need to call the Auth0 API?

Do you need to call the Auth0 API?
However, if you are building your authentication UI manually, you will need to call the Authentication API directly. Some example tasks include: Learn about and explore the requests and responses for the Auth0 Authentication API endpoints in your browser with the Authentication API Explorer.
What do JWTs do in Auth0 management API?
Auth0 Management API uses JSON Web Tokens (JWTs) to authenticating requests. The scopes claim of this token indicates which actions can be performed with it when calling this API. For example, this token would grant read-only access to users and read/write access to rules.
When to use the authentication API debugger ( Auth0 )?
The Authentication API Debugger is an Auth0 extension you can use to test several endpoints of the Authentication API. If it's the first time you use it, you have to install it using the dashboard. Once you do, you are ready to configure your app's settings and run your tests. Note that its URL varies according to your tenant's region:
How to authenticate with the OAuth2 API?
There are three ways to authenticate with this API: with an OAuth2 Access Token in the Authorization request header field (which uses the Bearer authentication scheme to transmit the Access Token) with your Client ID and Client Secret credentials. only with your Client ID.