Receive external data - Magento - magento

Question

First I want to say that this text was translated by Google Translate ( Excuses !).
How do I send data from an external server for my Magento store?
I looked hard for it today and found nothing basically want another system sends a notification to my Magento store and change the status of my order , I have not found a way to receiving external data in my store.
If you already have a related question I apologize.
Edit
This is my external file that sends the data:
$fields = '';
foreach($data as $key => $value) {
$fields .= $key . '=' . $value . '&';
}
rtrim($fields, '&');
$post = curl_init();
curl_setopt($post, CURLOPT_URL, $url);
curl_setopt($post, CURLOPT_POST, 1);
curl_setopt($post, CURLOPT_POSTFIELDS, $fields);
curl_setopt($post, CURLOPT_RETURNTRANSFER, 1);
var_dump($fields);
try {
$result = curl_exec($post);
$info = curl_getinfo($post);
echo curl_getinfo($post, CURLINFO_HTTP_CODE);
echo "<br>";
echo var_dump($info);
} catch (\Exception $e) {
$result = $e->getMessage();
echo $e;
}
}
$data = array(
"name" => "c.bavota",
"website" => "http://bavotasan.com",
"twitterID" => "bavotasan"
);
post_to_url("http://localhost/magento/safe/teste/mostra/", $data);
?>
This is my controller in Magento:
<?php
class Name_MyModule_TesteController extends Mage_Core_Controller_Front_Action{
public function mostraAction(){
$teste = $this->getRequest()->getPost('name');
echo 'Olá mundo';
echo '<br>Teste: '.isset($teste);
}
}
ps: I'm testing with locally with WAMP