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To integrate with Facebook, you have to create a Facebook app in the developer portal. You can find more details about creating Facebook apps here https://developers.facebook.com/docs/development#register .
Prerequisites
A valid Facebook Account.
A valid Facebook Developer Account.
A verified Facebook Business Account.
A valid Facebook Page.
Register A Facebook App
Go to Facebook developer portal and click on the “Create App” button
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Paste the App ID & App secret to Client-id & Client-Secret, the App ID & App secret obtain from Facebook App Settings here https://cloudfon.atlassian.net/wiki/spaces/CCSD/pages/edit-v2/52199764#Register-A-Facebook-App .
Copy the Authorized Redirect URL and paste to Facebook Login for Business here https://cloudfon.atlassian.net/wiki/spaces/CCSD/pages/edit-v2/52199764#Configure-Facebook-Login .
Copy the Webhook URL and paste to Facebook Messenger API Settings herehttps://cloudfon.atlassian.net/wiki/spaces/CCSD/pages/edit-v2/52199764#Configure-the-Facebook-App .
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That's all the Facebook integration, now, you can connect your Facebook pages to the Inbox > Channels > Facebook in your tenant here 3.1.2 Facebook !