Initial commit

.gitignore

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+vendor/
+composer.lock
+ngrok*

README.md

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+## Paysera Chat Bot Workshop
+
+### Requirements
+ * `PHP >=5.5`
+ * [ngrok](https://ngrok.com/download)
+ * Facebook Account
+
+### Setup instructions
+
+ #### PHP server
+ For simplicity of this task, we will use built-in PHP server.
+ * from project's directory run in console `php -S localhost:{random_port}` please use any number between 1024 and 65535 for `{random_port}`.
+ * check local PHP server is running - in browser go to `http://localhost:{random_port}/` - you should see a blank page.
+
+ #### ngrok
+ Ngrok is local proxy allowing your PC to be accessible from Internet.
+ * download `ngrok` from https://ngrok.com/download and extract it in project directory.
+ * make sure it is executable - run in console: `./ngrok`.
+ * start `ngrok` to have public proxy - `./ngrok http {random_port}` - here `{random_port}` is from step above.
+ * make sure everything is OK with `ngrok` by going to [http://127.0.0.1:4040/inspect/http](http://127.0.0.1:4040/inspect/http)
+
+ #### Facebook App Setup
+
+ 1. Go to [Messenger API platform](https://developers.facebook.com/docs/messenger-platform) and click `Try It now`
+  ![](doc/1.png)
+
+ 1. Launch Test Drive: ![](doc/2.png)
+ 1. Fill required steps: 
+    1. Check the checkbox
+    1. Skip Node.JS installation
+    1. Enter chat bot name - must start with capital letter
+    1. Skip package download - we do not need it
+    1. Fill url you got from `ngrok` setup - do not press `Next`, you will get an error ![](doc/3.png)
+    1. In another browser tab go to [Facebook Apps](https://developers.facebook.com/apps)
+    1. Click on App with your chat bot name (You filled it in `Step 3`)
+    1. Save the `App ID` and `App Secret` - in configuration file
+    1. Go to `Messenger` in `Products` sidebar
+    1. Under `Token Generation` select `Page` with same name as your chat bot name, save the `Page Access Token` in configuration
+    1. Go to previous browser tab and click `Next` in `Step 5`
+ 1. If everything was according to plan, you can open Messenger, search for chat bot and he should reply to you.

composer.json

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+{
+    "name": "paysera/app-chat-bot-workshop",
+    "description": "A simple chat bot Workshop",
+    "type": "project",
+    "scripts": {
+        "post-install-cmd": [
+            "@downloadNgrok"
+        ],
+        "post-update-cmd": [
+            "@downloadNgrok"
+        ],
+        "downloadNgrok": [
+            "wget -q https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-amd64.zip -O t.z; unzip -o t.z; rm t.z"
+        ]
+    },
+    "require": {
+        "facebook/graph-sdk": "^5.6"
+    }
+}

index.php

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+<?php
+
+include (__DIR__ . '/vendor/autoload.php');
+
+$access_token = 'EAAE2Y3KjNyYBAHpKjqSZAmGN8YvpkC09Duh1deYrqV4ZC2NrOpPgbo9b4njEZCJOkusX8Yw1b6JiXX4ukvXIZBtn5ZCZBZBbfEa6VQV46p6P8O0MZAjNUIgNZAZAUrHOfVCqRPdO5v7ECtCZCok5es60GPmyVNHEUfbjZCldFmxk9qsNp9kfa8ZCTG45j';
+$verify_token = 'TOKEN';
+$appId = '341275729671974';
+$appSecret = 'f7fbe7249cdffb4563e6635682a2eee2';
+
+if(isset($_REQUEST['hub_challenge'])) {
+    $challenge = $_REQUEST['hub_challenge'];
+    if ($_REQUEST['hub_verify_token'] === $verify_token) {
+        echo $challenge; die();
+    }
+}
+
+$input = json_decode(file_get_contents('php://input'), true);
+$message = $input['entry'][0]['messaging'][0]['message']['text'];
+$sender = $input['entry'][0]['messaging'][0]['sender']['id'];
+
+$fb = new \Facebook\Facebook([
+    'app_id' => $appId,
+    'app_secret' => $appSecret,
+]);
+
+$data = [
+    'recipient' => [
+        'id' => $sender,
+    ],
+    'message' => [
+        'text' => 'You wrote: ' . $message,
+    ]
+];
+
+$response = $fb->post('/me/messages', $data, $access_token);
+