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WebHooks plugin allows you to send notifications to external scripts. It works by sending http requests with event data to url defined in your webhook.

Installation

Proceed to Settings » Module. Search and activate "WebHooks" module.

After that you can navigate to Extras » WebHooks to manage your webhooks.

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WebHook settings

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• Name - name or description that will identify your webhook
• URL to be called - provide an URL to the script that will handle notifications, it does not have to be public but it has to be reachable from your HostBill installation.
  • Verify SSL certificate - check this option to verify that SSL certificate is valid before sending data.
• Status - set disabled if you do not want to send notification. 
• Request Content type - content type for the http request
• Secret - It will be generated automatically after you add new webhook, it can be used to validate requests.
• Events -  Select which events will be sent to specified url
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HTTP Request

Each request will include special headers that will allow you to validate it and with details about executed event and webhook

...

firstname=Joe&lastname=Doe

Request validation

Each request is signed with your secret key, this allows you to validate that the events were sent by your HostBill installation, not by a third party. 

Here are the steps required to validate request signature.

Step 1: Obtain timestamp and signature from response headers, the HB-Signature header contains signature that you want to verify and HB-Timestamp contains timestamp used to generate that signature.

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<?php

$secret = ''; // paste your Secret here

//fetch request body
$data = file_get_contents('php://input');
$payload = $_SERVER["HTTP_HB_TIMESTAMP"] . $data;

$signature = hash_hmac('sha256', $payload, $secret);

//compare signature in header with the one computed above
if($signature !== $_SERVER["HTTP_HB_SIGNATURE"])
    die('invalid signature')

// signature valid, verify timestamp
if($_SERVER["HTTP_HB_TIMESTAMP"] < time() - 60)
    die('timestamp older than 60 sec')

Note: Webhooks plugin helps you by showing sample code for each webhook you generate in webhook details.
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