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If you have issues authenticating, ensure the time is correct on both your Blesta server and the server the user is connected to. The shared login system will tolerate up to 30 minutes of clock drift.

<?php
// The key from [Settings] > [Company] > [Plugins] > [Shared Login]
$key = "0123456789abcdef0123456789abcde";
$t = time();
$u = "client_username";
$r = "http://mydomain.com/";
$h = hash_hmac("sha256", $t . $u . $r, $key);

header("Location: " . "https://yourdomain.com/path_to_blesta/plugin/shared_login/?u=" . $u . "&t=" . $t . "&r=" . $r . "&h=" . $h);
exit;
?>