Facebook Client ID
What is the Facebook Client ID and how to obtain it:
Obtaining a Facebook Client ID requires you to have a developer account on Facebook, and to create an app.
You'll be prompted to create an account with your personal Facebook, click Next.
Choose Developer as what describes you best.
Click the green button that says Create New.
Select "For Everything Else" for how you're using the app.
Enter a name for your App and the email you want to receive any notifications to.
Select your Business Manager account. If you don't have one, you can just create it later if you want to run Facebook ads for your funnel.
Once you complete that you should see your App ID in the top right corner.
Copy that ID.
Now you'll need to switch the Facebook app from "In development" to "Live".
Now head back to your Funnelish account, and go to your Global App section.
Turn on the Smart Optin app if it's not already done, and paste the App ID from Facebook.
Enable the Shown By Default switch if you want it on by default.
Click Save Changes.
Make sure the app is enabled in the funnels you want to use it.