This document briefs you on how to connect Orbita to the Facebook messenger bot.

Setting up the Experience Designer

Connect two function nodes before and after Bot provider V2 node. One for getting the input from Facebook and the other to Process the output sent to Facebook.

Design a flow as shown below.

For Facebook to verify our callback URL

Add “http in” node with URL as bot/dockflow and the Method: GET
Add a function node (named Verification) with the following code.
```
msg.payload = msg.payload['hub.challenge'];
return msg;
```
Add the “http out” node to the flow.

For connecting the chatbot

Add “http in” node with URL as bot/dockflow and the Method: POST

FB input

Place the below code in this function node.

if(msg.payload.entry[0].messaging[0].message)
    msg.payload.text = msg.payload.entry[0].messaging[0].message.text 
else
    msg.payload.text="Launch"
    msg.payload.fbSenderId = msg.payload.entry[0].messaging[0].sender.id;
return msg;

Process FB output

Place the below code in this function node. Place the Facebook page Access token you generated when the page is connected to the Facebook App, in the code (denoted by XXXXXX)

var stripTags = msg.payload.orbitaPayload.payload.multiagent.chat.chatText.replace(/<[^>]+>/g, '')
msg.payload=
{
  "messaging_type": "RESPONSE",
  "recipient": {
    "id": msg.orginalPayload.fbSenderId
  },
  "message": {
    "text":stripTags    
  }
}


msg.url = "https://graph.facebook.com/v4.0/me/messages?access_token=XXXXXX"
msg.method = 'POST';
msg.headers = {};
msg.headers['Content-Type'] = 'application/json';
return msg;

http request

Configure the HTTP request node as shown in the below screenshot before connecting it to “http out” node.

Sample flow

Setting up Facebook

In order to set up the Facebook integration for your agent, you'll need the following:

a Facebook account
a Facebook page to add your chatbot

When a user visits your page and sends a message, they'll be talking to your chatbot.

Create a Facebook App

Log in to the Facebook Developer Console.
Click on My Apps in the upper right-hand corner.
Click on Create App
Select Manage Business Integrations and click Continue.
Add a display name and click on Create App.

Making the App Public

Go to the App page and click on Settings > Basics.
Fill in the necessary details and click on Save Changes.
Toggle the status to ON. Click on Confirm in the pop-up dialog box.

Adding messenger to your App

Click on Products from the side menu, select Messenger, and click on the Set Up button.
In the Products > Messenger > Settings page, click on “Add or Remove Pages” to add your Facebook page to the App.

Access Tokens

In the Access tokens section of the settings page, click on the Generate token against the page you added.
Check the I Understand checkbox, click on Copy, and select Done.

The access token should be kept safe for later use.

Webhooks

In the Webhooks section, click on Add Callback URL.
Copy your web chatbot URL and paste it here.
For example, https://<yourdomain>.orbita.cloud:8443/oeapi/bot/dockflow
Click on Verify and save.
The Facebook will post a request to the callback URL and the Verify Token will be auto populated and saved in the Facebook app.
Click on the “Add Subscriptions” button and check the messages and messaging_postbacks options. Click on Save.

Ensure you have the following are populated and valid from the Settings > Basic page.

App icon
Valid privacy policy url
App purpose / Business use
App category

Make the app public

Please ensure to toggle on the Live status to make the app public.

For Business users, you need to do Business Verification to make the app public.
Click on the Get started and submit the verification to Facebook.

How to Connect Orbita to Facebook Messenger Bot