RocketChat.php

<?php

namespace WHMCS\Module\Notification\RocketChat;
require_once(dirname(__FILE__).'/vendor/autoload.php');
use GuzzleHttp\Client as Guzzle;
use WHMCS\Config\Setting;
use WHMCS\Exception;
use WHMCS\Module\Notification\DescriptionTrait;
use WHMCS\Module\Contracts\NotificationModuleInterface;
use WHMCS\Notification\Contracts\NotificationInterface;

class RocketChat implements NotificationModuleInterface
{
    use DescriptionTrait;

    public function __construct()
    {
        $this->setDisplayName('RocketChat')
            ->setLogoFileName('logo.svg');
    }

    public function settings()
    {
        return [
            'baseURL' => [
                'FriendlyName' => 'RocketChat Base URL',
                'Type' => 'text',
                'Description' => 'The base URL for your RocketChat instance (ie: https://chat.example.com)',
                'Placeholder' => "",
            ],
        ];
    }

    public function testConnection($settings)
    {
        return true;
    }

    public function notificationSettings()
    {
        return [
            'notificationToken' => [
                'FriendlyName' => 'Incoming WebHook Tokens',
                'Type' => 'text',
                'Description' => 'Choose the notification webhook tokens (comma delimit for more than one)',
		'Required' => true,
            ],
        ];
    }

    public function getDynamicField($fieldName, $settings)
    {
        return [];
    }

    public function sendNotification(NotificationInterface $notification, $moduleSettings, $notificationSettings)
    {
        $to = explode(',', $notificationSettings['notificationToken']);
        $to = array_filter(array_unique($to));
        if (!$to) {
            throw new Exception('No Notification tokens Found');
        }
	$postData=[
                'text' => sprintf("[%s](%s) \n %s", $notification->getTitle(), $notification->getUrl(), $notification->getMessage()),
	];
	foreach ($notification->getAttributes() as $attribute) {
	 	$postData['attachments'][] = [
            		'title' => $attribute->getLabel(),
            		'text' => $attribute->getValue(),
            		'title_link' => $attribute->getUrl(),
        	];
  	}
	foreach ($to as $k => $notificationToken) {
		$notificationURL=sprintf("%s/hooks/%s", $moduleSettings['baseURL'], $notificationToken);
		$client = new Guzzle();
		$response = $client->request('POST', $notificationURL, ['json' => $postData]);
	        if (array_key_exists('error', $response)) {
	            throw new Exception($response['error']);
	        }
	}
    }
}