GET call example in PHP

$identifier = '9b03c8cdf967d24a';
$private_key = '0a68ff8b77272baf5a04f3b656f27fb5250438bc21d7707515a1b506a3a8491b';

// GET params
$params = 'action=getSurveyQuestions';       // Function to execute
$params .= '&ank_id=705';        // parameters needed for function execution (survey id, question id ...) 

// Prepare data for hashing
$request_method = 'GET';
$request = 'https://www.1ka.si/admin/survey/api/api.php?'.$params;

$data = $request_method . $request;

// Calculate hash (token)
$token = hash_hmac('sha256', $data, $private_key);

// Prepare call – we add parameters 'identifier' and 'token' 
$ch = curl_init($request.'&identifier='.$identifier.'&token='.$token);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $request_method);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

// Execute call
$result = curl_exec($ch);