Implementing Authorization Code Flow with a custom user agent

We are in the process of evaluating Auth0 and we are wondering if there is a way to implement the Authorization Code Flow using a home-growth web user agent.

We have an application that functions is able to behave as a web browser and we are looking into having it interact with Auth0 so we can automatically respond to the login/authorization prompt on behalf of the end user without the need to have the user being prompted to enter that information.

None of the other flows described at https://auth0.com/docs/flows will work for us as we need to be able to receive and Authorization Code in order to request an Authorization Token

Any insight will be appreciated.

Thanks

Alfredo