Example in PHP

<?php
    
    include "MeridixSign.class.php";
       
    // Test parameters
    $url = "http://site.meridix.se/api/customer/listcustomers";
    $token = "35f94ba7c9bd4b7777b66baa8b566c28";
    $secret = "1a9e39f72f324a8";
    
    // Construct a new webservice caller object with the parameters above.
    $mws = new MeridixSign($url, $token, $secret);
    
    /// Redirect to a signed URL
    header("Location: " . $mws->getSignedUrl());
    
?> 

<?php
class MeridixSign {
    private $url;
    private $token;
    private $secret;
    public function __construct($url, $token, $secret) {
        // Set the correct timezone to ensure that gmtime gives the right result.
        date_default_timezone_set("Europe/Stockholm");
        $this->url = $url;
        $this->token = $token;
        $this->secret = $secret;
    }

    public function getSignedUrl() {
        // Create a random hex-value to use as nonce
        $nonce = substr(md5(rand()), 0, 8);
        // Create an array with the parameters to be used
        $params = array(
            "auth_nonce=" . $nonce,
            "auth_timestamp=" . gmdate("YmdHis"),
            "auth_token=" . $this->token
        );
        // Sort query params in alphabetical order
        sort($params);
        // Reassemble the sorted parameters into a query string by putting and
        // ampersand character between each parameter.
        $qs = implode("&", $params);
        // Concatenate method, url (without query string), query string and
        // the secret with ampersands inbetween
		//
		// IMPORTANT - The GET&-prefix must be change to POST& etc. when using different HTTP Verbs than GET.
		//
        $encodedurl = "GET&" .  urlencode($this->url) . "&" .urlencode($qs) .
                "&" . $this->secret;
        // Create an md5 signature of the complete encoded url
        $sig = md5($encodedurl);
        // Return the signed url
        return $this->url . "?" . $qs . "&auth_signature=" . $sig;
    }
}
 ?>