With your instance deployed, redirect users to:
https://YOUR_HANDSHAKE_INSTANCE_URL/auth/HANDLER_ID/redirectWhere HANDLER_ID is either mailup or the value passed to the optional id argument of the MailUp() factory. (See Options below.)
Handshake will take each user through the MailUp OAuth flow and before sending them back to you, at the URL specified by the callback_uri query parameter.
Modify your app/options.ts file to include the MailUp() handler like so:
import { MailUp, HandshakeOptions } from "handshake";
 
const config: HandshakeOptions = {
  handlers: [
    MailUp({
      clientId: string,
      clientSecret: string,
    });
  ],
}
 
// ...Consult the reference to learn about HandshakeOptions.
Facing an issue making MailUp work? Open an issue on GitHub to get help.