https://developer.auth0.com/resources/code-samples
Use different frontend and backend frameworks and languages to explore the authentication and authorization features of the Auth0 Identity Platform.
authorization codeauthenticationsamples
https://www.oauth.com/oauth2-servers/access-tokens/authorization-code-request/
The authorization code grant is used when an application exchanges an authorization code for an access token. After the user returns to the application
authorization coderequestoauthsimplified