You can use the Test Auth tool to manually commence the Authentication Code oauth workflow. This can be used in test mode to assist with the development of your integration.

This tool allows you to select one of your redirect uris, the scopes for the request, and a state value. Some defaults are selected automatically to get you started.

The generated Request URL is shown on screen, you can use this as a reference when building your oauth authentication.

You can click the Request Authorization button to begin the oauth authorization code handshake. This opens in a popup window. You can also right click and choose to open in a new tab instead if desired.