//Your application's credentials for using the API
$myAppKey = '12345678910111213';
$myAppSecret = 'IWillNeverTellThisToAnyone';
 
//Set the correct API URL to use
$apiUrl = 'https://api.allyve.com/api/sociallyve/protected/user/externalid';
 
//construct an array with all the neccessary parameters needed for the request to the API
$params["timestamp"] = time();
$params["applicationid"] = $myAppKey;
$params["provider"] = 'facebook';
$params["uid"] = 'userIdAtFacebook';
$params["externalid"] = 'DarthVader';
 
//sort the parameters array alphabetically by the array keys
ksort($params);
 
//construct a temporary array, that will hold concatinated keys and values of the parameter array (key=value)
$tempArray = array();
//walk over the parameter array and combine each key and value
foreach ($params as $key => $value) {
	$tempArray[] = $key . "=" . $value;
}
 
//construct a properly formatted querystring from the combined key/values
$queryStringUnsigned = implode("&", $tempArray);
 
//construct the signature
$querySignature	= base64_encode(hash_hmac("sha1", $queryStringUnsigned, $myAppSecret, true));
//append the signature to the unsingend query string
$queryStringSigned = $queryStringUnsigned . "&signature=" . urlencode($querySignature);
 
//let's call the API with the help of CURL
$curl = curl_init($apiUrl);
curl_setopt ($curl, CURLOPT_POST, TRUE);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
//If you do not have alredy set up a CA cert bundle in PEM format uncomment the next line, BUT YOU SHOULD NOT DO THAT IN PRODUCTION
//curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
 
//If you have a CA cert bundle set the path to it (http://curl.haxx.se/docs/caextract.html)
$pathToMyCertBundle = getcwd().'/cacert.pem';
curl_setopt($curl, CURLOPT_CAINFO, $pathToMyCertBundle);
 
curl_setopt($curl, CURLOPT_POSTFIELDS, $queryStringSigned);
 
curl_exec($curl);
$info = curl_getinfo($curl);
 
curl_close($curl);
 
if (is_array($info) && isset($info['http_code']) && $info['http_code'] == 200) {
	echo 'ok';
} else {
	echo 'error';
}