Re howdyai#552 - add support for referral param via postbacks (Facebook)

Author: johngriffin

lib/Facebook.js

@@ -251,7 +251,7 @@ function Facebookbot(configuration) {
 
                             facebook_botkit.receiveMessage(bot, message);
                         } else if (facebook_message.postback) {
-
+                          console.log(facebook_message)
                             // trigger BOTH a facebook_postback event
                             // and a normal message received event.
                             // this allows developers to receive postbacks as part of a conversation.
@@ -261,6 +261,7 @@ function Facebookbot(configuration) {
                                 user: facebook_message.sender.id,
                                 channel: facebook_message.sender.id,
                                 timestamp: facebook_message.timestamp,
+                                referral: facebook_message.postback.referral,
                             };
 
                             facebook_botkit.trigger('facebook_postback', [bot, message]);
@@ -271,6 +272,7 @@ function Facebookbot(configuration) {
                                     user: facebook_message.sender.id,
                                     channel: facebook_message.sender.id,
                                     timestamp: facebook_message.timestamp,
+                                    referral: facebook_message.postback.referral,
                                     type: 'facebook_postback',
                                 };