By default, visitors to your custom domain will log in using Updote account. You can add your own login URL which redirects back to your page with an SSO token.

The example flow is like this:

• A user visit help.fastcron.com
• They click the Login with FastCron button
• They're taken to https://www.fastcron.com/updote
• If they're not logged in yet, they log in using their FastCron account
• FastCron redirects back to https://help.fastcron.com/?ssoToken=....
• They're logged in at help.fastcron.com, ready to like and comment.

To add a Login URL, visit profile widget > Add to website.