Consuming web-hooks

N-Genius Online supports the integration of web-hooks (sometimes referred to as call-backs). When web-hooks are enabled on your account, whenever a key event occurs against one of your orders, a message is posted to a secure URL on your server/environment providing you with information about what happened.

You can benefit from the web-hooks service no matter how you are using the N-Genius Online payment gateway. If they are enabled, you will be notified of any key update to your customers' orders. However, they are particularly useful in the following scenarios:

• When you want to discover the outcome of any Hosted Payment Page transaction, even if your customer has closed their browser window before redirecting back to your site.
• When you are operating an invoicing service (whether via API or manually via the N-Genius Online portal), and you want to be notified when your customer has made the payment.
• When you want to more closely link the N-Genius Online gateway service to your back-end systems, without having to implement inefficient polling operations.

Configuring web-hooks

You may configure a web-hook at any time by logging in to the N-Genius Online portal and navigating to the Settings > Integrations > Webhooks section.

Simply click on the 'New' button and enter the required details:

• Name: a simple description for your web-hook (i.e. "My web-hook")
• URL: the fully qualified (secure) URL on your server to which web-hook data will be posted
• Header Key (optional): an optional header key you can use for additional security
• Header Value (optional): the value of the defined header key, above.

Finally, click 'Add' to finalize your web-hook configuration.

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Web-hook white-listing

When you configure a web-hook in N-Genius Online, it will not immediately begin sending web-hook data to your nominated URL. A further process is required to check and white-list your URL, after which you will be notified that your web-hook is active.

Once your white-list is active, you will begin receiving order and event data to your nominated URL whenever a key event occurs.

Key events triggering web-hooks

Below is a list of key events that, when they occur against one of your orders, will trigger a web-hook post to your nominated URL:

Note that you may receive a number of web-hook messages in quick succession to your nominated URL. It is your responsibility to filter these as best meets the needs of your business, and to drive your downstream processes accordingly.

Please also note that only a single web-hook message will be sent to your nominated URL, per event, with no retries.

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Multiple web-hooks per order

It is important to note that, for orders processed in SALE mode (whereby a transaction is AUTHORISED and then immediately CAPTURED, ready for settlement) your nominated URL will receive multiple web-hooks at the same - one for the AUTHORISED event, and another for the CAPTURED event.

We recommend that, if you are processing payments _exclusively _in 'SALE' mode, you should ignore any AUTHORISED web-hook events posted to your nominated URL, and use only the CAPTURED events to drive your downstream processes.

If you are processing your orders in PURCHASE mode, which is recommended in most scenarios, only one web-hook for the payment outcome will be received (a 'PURCHASED' event).

Interpreting web-hook data

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Response to web-hook request

When you consume the web-hook you need to respond to N-Genius Online with either 200 or 201 for the POST request from N-Genius Online. N-Genius Online will timeout after 15 seconds if you do not respond to the web-hook request.

Web-hook data posted to your nominated URL will follow the standard order object model detailed in the The order object section, with one exception: the order object received will be enclosed in an 'event' JSON container/wrapper, as follows:

{
  
  eventName: 'AUTHORISED',
  order {
   
    // order data
    
  }
  
}

Example web-hook handling script (HTML, PHP + MySQL):

<?php

  $db = init_database();

  try {

    $json = file_get_contents("php://input");
    $order = json_decode($json);
    
    $sql = "INSERT INTO orders (  event, 
                                  outlet, 
                                  reference, 
                                  email, 
                                  currency, 
                                  amount ) VALUES (  :event, 
                                                          :outlet, 
                                                          :ref, 
                                                          :email, 
                                                          :currency, 
                                                          :amount );";      
    $stmt = $db->prepare($sql);

    $stmt->bindParam(":event", $order->eventName);
    $stmt->bindParam(":outlet", $order->order->outletId);
    $stmt->bindParam(":ref", $order->order->reference);
    $stmt->bindParam(":email", $order->order->emailAddress);
    $stmt->bindParam(":currency", $order->order->amount->currencyCode);
    $stmt->bindParam(":amount", number_format($order->order->amount->value / 100, 2));
    $stmt->execute();

    echo '{"success": true}';

    $db = null;      

  }
  catch(PDOException $e) 
  {
    
    $sql = "INSERT INTO orders() VALUES();";
    $stmt = $db->prepare($sql);
    $stmt->execute();

    echo '{"error":{"text":'. $e->getMessage() .'}}';

    $db = null;      

  }		    

  die();

  function init_database() {

    $dbhost="[your-db-host]";
    $dbuser="[your-db-user]";
    $dbpass="[your-db-pwd]";
    $dbname="[your-db-name]";
    $dbh = new PDO("mysql:host=$dbhost;dbname=$dbname;", $dbuser, $dbpass);
    $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    return $dbh;

  }

?>