# Signature des requêtes

Toutes les requêtes envoyées sur vos endpoint sont signées à l'aide de la clé secrète liée au endpoint.

Côté Cards, la signature est créée à l'aide du payload, encrypté avec votre clé :

```php
$payloadJson = json_encode($payload); 
$signature = hash_hmac('sha256', $payloadJson, $secret_endpoint_key);
```

Cette signature est présente dans l'en-tête de la requête, dans la variable `Cards-Signature`.

Voilà un exemple de code PHP pour récupérer la requête et la vérifier : 

```php
// secret key of the webhook endpoint
$endpoint_secret = 'xxxx';

// get payload
$payload = @file_get_contents('php://input');

// get signature
$signature_header = '';
$headers = apache_request_headers();
if (isset($headers['Cards-Signature']) and !empty($headers['Cards-Signature'])) {
    $signature_header = $headers['Cards-Signature'];
}

// verify signature
$buildHash = hash_hmac('sha256', $payload, $secret_endpoint_key);
if ($buildHash !== $signature_header) {
    // key is incorrect
    http_response_code(400);
    exit();
}

// get payload data
$event_type = false;
if (isset($payload) and !empty($payload)) {
    $payload = json_decode($payload);
    $event_type = $payload->type;
}

// handle the request
if ($event_type == 'survey-complete') {
    // a survey has been complete
} elseif ($event_type == 'quiz-complete') {
    // a quiz has been complete
} elseif ($event_type == 'chapter-complete') {
    // a chapter has been complete
} elseif ($event_type == 'training-complete') {
    // a training has been complete
}
```


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