Slack requires you that the redirect URL of your app uses
https, even for local development. An easy workaround for this is using a service like
ngrok that creates a secure tunnel to your app, using
https. Remember to set the url as
NEXTAUTH_URL as well.
The Slack Provider comes with a set of default options:
You can override any of the options to suit your own use case.
import SlackProvider from "next-auth/providers/slack";