PrestaShop, send in_transit email on tracking number update.

changeTrackingNumber.php

<?php
// Change this to the order ID you want to update
$ORDER_ID = "YOUR ORDER ID";

$reqOrderCarriers = array(
	"resource" => "order_carriers",
	"display" => "[id]",
	"filter[id_order]" => "[" . $ORDER_ID . "]"
);

// Get the order_carriers available for the order we want
try{
	$orderCarrierId = $webService->get($reqOrderCarriers);
}
catch(PrestaShopWebserviceException $e){
	error_log("Couldn't get order carriers! " . $e);
	continue;
}

if(!empty($orderCarrierId)){
	// Loop through the found order_carriers
	foreach($orderCarrierId->order_carriers->order_carrier as $k => $v){
		// Get all the data for the specific order_carrier
		$orderCarrier = $webService->get(array("resource" => "order_carriers", "id" => "" . $v->id));

		// Change this to the tracking number you want for the order
		$orderCarrier->order_carrier->tracking_number = "THE TRACKING NUMBER";

		// The next line can be removed, I used this as our software provides the proper weight for the parcel.
		$orderCarrier->order_carrier->weight = $weight <= 0 ? $orderCarrier->order_carrier->weight : $weight;

		$reqOpt = array(
			"resource" => "order_carriers",
			"id" => $v->id,
			"putXml" => trim($orderCarrier->asXML()),
			"sendemail" => 1 // This is the non-standard parameter which allows the PSWebServiceLibrary to tell PrestaShop to send the email
		);

		// Update the tracking number
		try{
			$webService->edit($reqOpt);
			echo "Successfully added tracking number to order #" . $orderCarrier->order_carrier->id_order;
		}
		catch(PrestaShopWebserviceException $e){
			error_log("Couldn't edit order carriers! " . $e);
		}
	}
}

OrderCarrier.php

<?php
/*
* 2007-2016 PrestaShop
*
* NOTICE OF LICENSE
*
* This source file is subject to the Open Software License (OSL 3.0)
* that is bundled with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/osl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <contact@prestashop.com>
*  @copyright  2007-2016 PrestaShop SA
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

class OrderCarrier extends OrderCarrierCore
{
    protected $webserviceParameters = array(
        'objectMethods' => array('update' => 'updateWs'),
        'fields' => array(
            'id_order' => array('xlink_resource' => 'orders'),
            'id_carrier' => array('xlink_resource' => 'carriers'),
        ),
    );

    /**
     * @param Order $order Required
     * @return bool
     */
    public function sendInTransitEmail($order)
    {
        $customer = new Customer((int)$order->id_customer);
        $carrier = new Carrier((int)$order->id_carrier, $order->id_lang);
        if (!Validate::isLoadedObject($customer)) {
            throw new PrestaShopException('Can\'t load Customer object');
        }
        if (!Validate::isLoadedObject($carrier)) {
            throw new PrestaShopException('Can\'t load Carrier object');
        }
        $orderLanguage = new Language((int) $order->id_lang);
        $templateVars = array(
            '{followup}' => str_replace('$order_reference', $order->reference, str_replace('@', $this->tracking_number, $carrier->url)),
            '{firstname}' => $customer->firstname,
            '{lastname}' => $customer->lastname,
            '{id_order}' => $order->id,
            '{shipping_number}' => $this->tracking_number,
            '{order_name}' => $order->getUniqReference()
        );

        if (@Mail::Send(
            (int)$order->id_lang,
            'in_transit',
            Mail::l(
                'Package in transit',
                (int)$order->id_lang
            ),
            $templateVars,
            $customer->email,
            $customer->firstname . ' ' . $customer->lastname,
            null,
            null,
            null,
            null,
            _PS_MAIL_DIR_,
            true,
            (int)$order->id_shop
        )) {
            return true;
        } else {
            return false;
        }
    }

    public function updateWs()
    {
        if (!parent::update()) {
            return false;
        }

        $sendemail = (bool)Tools::getValue('sendemail', false);
        error_log(print_r($_REQUEST, true));
        //$this->tracking_number = Tools::getValue('', $this->tracking_number);

        if ($sendemail) {
            $order = new Order((int)$this->id_order);
            if (!Validate::isLoadedObject($order)) {
                throw new PrestaShopException('Can\'t load Order object');
            }

            if (!$this->sendInTransitEmail($order))
            {
                return false;
            }
        }

        return true;
    }
}

PSWebServiceLibrary.php

<?php
/*
* 2007-2013 PrestaShop
*
* NOTICE OF LICENSE
*
* This source file is subject to the Open Software License (OSL 3.0)
* that is bundled with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/osl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <contact@prestashop.com>
*  @copyright  2007-2013 PrestaShop SA
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
* PrestaShop Webservice Library
* @package PrestaShopWebservice
*/

/**
 * @package PrestaShopWebservice
 */
class PrestaShopWebservice
{

	/** @var string Shop URL */
	protected $url;

	/** @var string Authentification key */
	protected $key;

	/** @var boolean is debug activated */
	protected $debug;

	/** @var string PS version */
	protected $version;

	/** @var array compatible versions of PrestaShop Webservice */
	const psCompatibleVersionsMin = '1.4.0.0';
	const psCompatibleVersionsMax = '1.7.1.99'; // @NOTE Not tested on anything above 1.6.1.X, but will allow you to use this library with 1.7.1, for now...

	/**
	 * PrestaShopWebservice constructor. Throw an exception when CURL is not installed/activated
	 * <code>
	 * <?php
	 * require_once('./PrestaShopWebservice.php');
	 * try
	 * {
	 * 	$ws = new PrestaShopWebservice('http://mystore.com/', 'ZQ88PRJX5VWQHCWE4EE7SQ7HPNX00RAJ', false);
	 * 	// Now we have a webservice object to play with
	 * }
	 * catch (PrestaShopWebserviceException $ex)
	 * {
	 * 	echo 'Error : '.$ex->getMessage();
	 * }
	 * ?>
	 * </code>
	 * @param string $url Root URL for the shop
	 * @param string $key Authentification key
	 * @param mixed $debug Debug mode Activated (true) or deactivated (false)
	*/
	function __construct($url, $key, $debug = true) {
		if (!extension_loaded('curl'))
		  throw new PrestaShopWebserviceException('Please activate the PHP extension \'curl\' to allow use of PrestaShop webservice library');
		$this->url = $url;
		$this->key = $key;
		$this->debug = $debug;
		$this->version = 'unknown';
	}

	/**
	 * Take the status code and throw an exception if the server didn't return 200 or 201 code
	 * @param int $status_code Status code of an HTTP return
	 */
	protected function checkStatusCode($status_code)
	{
		$error_label = 'This call to PrestaShop Web Services failed and returned an HTTP status of %d. That means: %s.';
		switch($status_code)
		{
			case 200:	case 201:	break;
			case 204: throw new PrestaShopWebserviceException(sprintf($error_label, $status_code, 'No content'));break;
			case 400: throw new PrestaShopWebserviceException(sprintf($error_label, $status_code, 'Bad Request'));break;
			case 401: throw new PrestaShopWebserviceException(sprintf($error_label, $status_code, 'Unauthorized'));break;
			case 404: throw new PrestaShopWebserviceException(sprintf($error_label, $status_code, 'Not Found'));break;
			case 405: throw new PrestaShopWebserviceException(sprintf($error_label, $status_code, 'Method Not Allowed'));break;
			case 500: throw new PrestaShopWebserviceException(sprintf($error_label, $status_code, 'Internal Server Error'));break;
			default: throw new PrestaShopWebserviceException('This call to PrestaShop Web Services returned an unexpected HTTP status of:' . $status_code);
		}
	}
	/**
	 * Handles a CURL request to PrestaShop Webservice. Can throw exception.
	 * @param string $url Resource name
	 * @param mixed $curl_params CURL parameters (sent to curl_set_opt)
	 * @return array status_code, response
	 */
	protected function executeRequest($url, $curl_params = array())
	{
		$defaultParams = array(
			CURLOPT_HEADER => TRUE,
			CURLOPT_RETURNTRANSFER => TRUE,
			CURLINFO_HEADER_OUT => TRUE,
			CURLOPT_HTTPAUTH => CURLAUTH_BASIC,
			CURLOPT_USERPWD => $this->key.':',
			CURLOPT_HTTPHEADER => array( 'Expect:' ),
			CURLOPT_USERAGENT => 'PSWebServiceLibrary'
		);

		$session = curl_init($url);

		$curl_options = array();
		foreach ($defaultParams as $defkey => $defval)
		{
			if (isset($curl_params[$defkey]))
				$curl_options[$defkey] = $curl_params[$defkey];
			else
				$curl_options[$defkey] = $defaultParams[$defkey];
		}
		foreach ($curl_params as $defkey => $defval)
			if (!isset($curl_options[$defkey]))
				$curl_options[$defkey] = $curl_params[$defkey];

		curl_setopt_array($session, $curl_options);
		$response = curl_exec($session);

		$index = strpos($response, "\r\n\r\n");
		if ($index === false && $curl_params[CURLOPT_CUSTOMREQUEST] != 'HEAD')
			throw new PrestaShopWebserviceException('Bad HTTP response');

		$header = substr($response, 0, $index);
		$body = substr($response, $index + 4);

		$headerArrayTmp = explode("\n", $header);

		$headerArray = array();
		foreach ($headerArrayTmp as &$headerItem)
		{
			$tmp = explode(':', $headerItem);
			$tmp = array_map('trim', $tmp);
			if (count($tmp) == 2)
				$headerArray[$tmp[0]] = $tmp[1];
		}

		if (array_key_exists('PSWS-Version', $headerArray))
		{
			$this->version = $headerArray['PSWS-Version'];
			if (
				version_compare(PrestaShopWebservice::psCompatibleVersionsMin, $headerArray['PSWS-Version']) == 1 ||
				version_compare(PrestaShopWebservice::psCompatibleVersionsMax, $headerArray['PSWS-Version']) == -1
			)
			throw new PrestaShopWebserviceException('This library is not compatible with this version of PrestaShop. Please upgrade/downgrade this library');
		}

		if ($this->debug)
		{
			$this->printDebug('HTTP REQUEST HEADER', curl_getinfo($session, CURLINFO_HEADER_OUT));
			$this->printDebug('HTTP RESPONSE HEADER', $header);

		}
		$status_code = curl_getinfo($session, CURLINFO_HTTP_CODE);
		if ($status_code === 0)
			throw new PrestaShopWebserviceException('CURL Error: '.curl_error($session));
		curl_close($session);
		if ($this->debug)
		{
			if ($curl_params[CURLOPT_CUSTOMREQUEST] == 'PUT' || $curl_params[CURLOPT_CUSTOMREQUEST] == 'POST')
				$this->printDebug('XML SENT', urldecode($curl_params[CURLOPT_POSTFIELDS]));
			if ($curl_params[CURLOPT_CUSTOMREQUEST] != 'DELETE' && $curl_params[CURLOPT_CUSTOMREQUEST] != 'HEAD')
				$this->printDebug('RETURN HTTP BODY', $body);
		}
		return array('status_code' => $status_code, 'response' => $body, 'header' => $header);
	}

	public function printDebug($title, $content)
	{
		echo '<div style="display:table;background:#CCC;font-size:8pt;padding:7px"><h6 style="font-size:9pt;margin:0">'.$title.'</h6><pre>'.htmlentities($content).'</pre></div>';
	}

	public function getVersion()
	{
		return $this->version;
	}

	/**
	 * Load XML from string. Can throw exception
	 * @param string $response String from a CURL response
	 * @return SimpleXMLElement status_code, response
	 */
	protected function parseXML($response)
	{
		if ($response != '')
		{
			libxml_clear_errors();
			libxml_use_internal_errors(true);
			$xml = simplexml_load_string($response,'SimpleXMLElement', LIBXML_NOCDATA);
			if (libxml_get_errors())
			{
				$msg = var_export(libxml_get_errors(), true);
				libxml_clear_errors();
				throw new PrestaShopWebserviceException('HTTP XML response is not parsable: '.$msg);
			}
			return $xml;
		}
		else
			throw new PrestaShopWebserviceException('HTTP response is empty');
	}

	/**
	 * Add (POST) a resource
	 * <p>Unique parameter must take : <br><br>
	 * 'resource' => Resource name<br>
	 * 'postXml' => Full XML string to add resource<br><br>
	 * Examples are given in the tutorial</p>
	 * @param array $options
	 * @return SimpleXMLElement status_code, response
	 */
	public function add($options)
	{
		$xml = '';

		if (isset($options['resource'], $options['postXml']) || isset($options['url'], $options['postXml']))
		{
			$url = (isset($options['resource']) ? $this->url.'/api/'.$options['resource'] : $options['url']);
			$xml = $options['postXml'];
			if (isset($options['id_shop']))
				$url .= '&id_shop='.$options['id_shop'];
			if (isset($options['id_group_shop']))
				$url .= '&id_group_shop='.$options['id_group_shop'];
		}
		else
			throw new PrestaShopWebserviceException('Bad parameters given');
		$request = self::executeRequest($url, array(CURLOPT_CUSTOMREQUEST => 'POST', CURLOPT_POSTFIELDS => $xml));

		self::checkStatusCode($request['status_code']);
		return self::parseXML($request['response']);
	}

	/**
 	 * Retrieve (GET) a resource
	 * <p>Unique parameter must take : <br><br>
	 * 'url' => Full URL for a GET request of Webservice (ex: http://mystore.com/api/customers/1/)<br>
	 * OR<br>
	 * 'resource' => Resource name,<br>
	 * 'id' => ID of a resource you want to get<br><br>
	 * </p>
	 * <code>
	 * <?php
	 * require_once('./PrestaShopWebservice.php');
	 * try
	 * {
	 * $ws = new PrestaShopWebservice('http://mystore.com/', 'ZQ88PRJX5VWQHCWE4EE7SQ7HPNX00RAJ', false);
	 * $xml = $ws->get(array('resource' => 'orders', 'id' => 1));
	 *	// Here in $xml, a SimpleXMLElement object you can parse
	 * foreach ($xml->children()->children() as $attName => $attValue)
	 * 	echo $attName.' = '.$attValue.'<br />';
	 * }
	 * catch (PrestaShopWebserviceException $ex)
	 * {
	 * 	echo 'Error : '.$ex->getMessage();
	 * }
	 * ?>
	 * </code>
	 * @param array $options Array representing resource to get.
	 * @return SimpleXMLElement status_code, response
	 */
	public function get($options)
	{
		if (isset($options['url']))
			$url = $options['url'];
		elseif (isset($options['resource']))
		{
			$url = $this->url.'/api/'.$options['resource'];
			$url_params = array();
			if (isset($options['id']))
				$url .= '/'.$options['id'];

			$params = array('filter', 'display', 'sort', 'limit', 'id_shop', 'id_group_shop', 'sendemail');
			foreach ($params as $p)
				foreach ($options as $k => $o)
					if (strpos($k, $p) !== false)
						$url_params[$k] = $options[$k];
			if (count($url_params) > 0)
				$url .= '?'.http_build_query($url_params);
		}
		else
			throw new PrestaShopWebserviceException('Bad parameters given');

		$request = self::executeRequest($url, array(CURLOPT_CUSTOMREQUEST => 'GET'));

		self::checkStatusCode($request['status_code']);// check the response validity
		return self::parseXML($request['response']);
	}

	/**
 	 * Head method (HEAD) a resource
	 *
	 * @param array $options Array representing resource for head request.
	 * @return SimpleXMLElement status_code, response
	 */
	public function head($options)
	{
		if (isset($options['url']))
			$url = $options['url'];
		elseif (isset($options['resource']))
		{
			$url = $this->url.'/api/'.$options['resource'];
			$url_params = array();
			if (isset($options['id']))
				$url .= '/'.$options['id'];

			$params = array('filter', 'display', 'sort', 'limit', 'sendemail');
			foreach ($params as $p)
				foreach ($options as $k => $o)
					if (strpos($k, $p) !== false)
						$url_params[$k] = $options[$k];
			if (count($url_params) > 0)
				$url .= '?'.http_build_query($url_params);
		}
		else
			throw new PrestaShopWebserviceException('Bad parameters given');
		$request = self::executeRequest($url, array(CURLOPT_CUSTOMREQUEST => 'HEAD', CURLOPT_NOBODY => true));
		self::checkStatusCode($request['status_code']);// check the response validity
		return $request['header'];
	}
	/**
	 * Edit (PUT) a resource
	 * <p>Unique parameter must take : <br><br>
	 * 'resource' => Resource name ,<br>
	 * 'id' => ID of a resource you want to edit,<br>
	 * 'putXml' => Modified XML string of a resource<br><br>
	 * Examples are given in the tutorial</p>
	 * @param array $options Array representing resource to edit.
	 */
	public function edit($options)
	{
		$xml = '';
		if (isset($options['url'], $options['putXml']))
			$url = $options['url'];
		elseif (isset($options['resource'], $options['id'], $options['putXml'])){
			$url = $this->url.'/api/'.$options['resource'].'/'.$options['id'];
			$url_params = array();

			$params = array('id_group_shop', 'id_shop', 'sendemail');
			foreach ($params as $p)
				foreach ($options as $k => $o)
					if (strpos($k, $p) !== false)
						$url_params[$k] = $options[$k];
			if (count($url_params) > 0)
				$url .= '?'.http_build_query($url_params);
			}
		else
			throw new PrestaShopWebserviceException('Bad parameters given');

		$xml = $options['putXml'];

		$request = self::executeRequest($url,  array(CURLOPT_CUSTOMREQUEST => 'PUT', CURLOPT_POSTFIELDS => $xml));
		self::checkStatusCode($request['status_code']);// check the response validity
		return self::parseXML($request['response']);
	}

	/**
	 * Delete (DELETE) a resource.
	 * Unique parameter must take : <br><br>
	 * 'resource' => Resource name<br>
	 * 'id' => ID or array which contains IDs of a resource(s) you want to delete<br><br>
	 * <code>
	 * <?php
	 * require_once('./PrestaShopWebservice.php');
	 * try
	 * {
	 * $ws = new PrestaShopWebservice('http://mystore.com/', 'ZQ88PRJX5VWQHCWE4EE7SQ7HPNX00RAJ', false);
	 * $xml = $ws->delete(array('resource' => 'orders', 'id' => 1));
	 *	// Following code will not be executed if an exception is thrown.
	 * 	echo 'Successfully deleted.';
	 * }
	 * catch (PrestaShopWebserviceException $ex)
	 * {
	 * 	echo 'Error : '.$ex->getMessage();
	 * }
	 * ?>
	 * </code>
	 * @param array $options Array representing resource to delete.
	 */
	public function delete($options)
	{
		if (isset($options['url']))
			$url = $options['url'];
		elseif (isset($options['resource']) && isset($options['id']))
			if (is_array($options['id']))
				$url = $this->url.'/api/'.$options['resource'].'/?id=['.implode(',', $options['id']).']';
			else
				$url = $this->url.'/api/'.$options['resource'].'/'.$options['id'];
		if (isset($options['id_shop']))
			$url .= '&id_shop='.$options['id_shop'];
		if (isset($options['id_group_shop']))
			$url .= '&id_group_shop='.$options['id_group_shop'];
		if(isset($options['sendemail']))
			$url .= '&sendemail=' . $options['sendemail'];
		$request = self::executeRequest($url, array(CURLOPT_CUSTOMREQUEST => 'DELETE'));
		self::checkStatusCode($request['status_code']);// check the response validity
		return true;
	}


}

/**
 * @package PrestaShopWebservice
 */
class PrestaShopWebserviceException extends Exception { }