Develop Authentication for a new backend

Hi,
We want to develop a new backend for our Oracle Content and Experience product. It is an OAuth authentication. There is a URL of the form (hostname/param=GET_OAUTH_TOKEN) which when executed by a user on a browser, providing his username and password gives a JSON that has a token in it. This URL has to be opened in the browser only. There is no client id/client secret/scope which is required to be provided in the URL. How can we use existing oauth in rclone to configure this authentication? Do we require some custome development or can we use existing code?