"4011",
        "VK_VERSION"     => "008",
        "VK_SND_ID"      => "uid100036",
        "VK_REPLY"       => "3012",
        "VK_RETURN"      => "https://pangalink.indoorsman.ee/project/99gAuWmrMGn633n7?auth_action=success",
        "VK_DATETIME"    => "2025-11-04T14:24:50+0000",
        "VK_RID"         => "1762266290061",
        "VK_ENCODING"    => "utf-8",
);
// STEP 3. Generate data to be signed
// ==================================
// Data to be signed is in the form of XXXYYYYY where XXX is 3 char
// zero padded length of the value and YYY the value itself
// NB! SEB expects symbol count, not byte count with UTF-8,
// so use `mb_strlen` instead of `strlen` to detect the length of a string
$data = str_pad (mb_strlen($fields["VK_SERVICE"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_SERVICE"] .    /* 4011 */
        str_pad (mb_strlen($fields["VK_VERSION"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_VERSION"] .    /* 008 */
        str_pad (mb_strlen($fields["VK_SND_ID"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_SND_ID"] .     /* uid100036 */
        str_pad (mb_strlen($fields["VK_REPLY"], "UTF-8"),   3, "0", STR_PAD_LEFT) . $fields["VK_REPLY"] .      /* 3012 */
        str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] .     /* https://pangalink.indoorsman.ee/project/99gAuWmrMGn633n7?auth_action=success */
        str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"] .   /* 2025-11-04T14:24:50+0000 */
        str_pad (mb_strlen($fields["VK_RID"], "UTF-8"),     3, "0", STR_PAD_LEFT) . $fields["VK_RID"];         /* 1762266290061 */
/* $data = "0044011003008009uid1000360043012076https://pangalink.indoorsman.ee/project/99gAuWmrMGn633n7?auth_action=success0242025-11-04T14:24:50+00000131762266290061"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* OUkoWhVnD8dfmtM+TR+aIa1pc6fA/h/rvBlnrrOtM8QqCPUfOvPM4PLNYPRap6trOSccl3IvMQyShm6+j+xCbcvdy0LjN0ZLEim8BZ4nKYL5fCu8kHrf/Q02SgWi2ts0tj94DlrySPnk3lVqVKvfkbwuJCBCGrOBEatQq88v1LiVMMU5E61SiKqUwiIJW62ze1nml/CQ8Ion3lGgJPtHqYhSC2wZz0Nx3TYisrIhih1i9rZS9HFUdXZxtGDA+ueJcgtKG3nUhDS/1Ws6/cEMvmSCQZIwoqF6LF0RTWA5igcS+xOk/8Bp/vfKtaIO3+7OGUNMjRLbeZhD9PYZBHJEww== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
        
        Autentimise näidisrakendus "SEB"