"1012",
        "VK_VERSION"     => "008",
        "VK_SND_ID"      => "uid100049",
        "VK_STAMP"       => "67256",
        "VK_AMOUNT"      => "16.2",
        "VK_CURR"        => "EUR",
        "VK_REF"         => "672564",
        "VK_MSG"         => "Order nr. 67256",
        "VK_RETURN"      => "https://romet.vm-backend.dev.elkdata.ee/payment/callback/order/bank",
        "VK_CANCEL"      => "https://romet.vm-backend.dev.elkdata.ee/payment/callback/order/bank",
        "VK_DATETIME"    => "2022-06-22T11:57:11+0300",
        "VK_LANG"        => "EST",
        "VK_ACC"         => "EE171010123456789017",
        "VK_NAME"        => "Veebimajutus",
        "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! LHV 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) . $fields["VK_SERVICE"] .    /* 1012 */
        str_pad (mb_strlen($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) . $fields["VK_SND_ID"] .     /* uid100049 */
        str_pad (mb_strlen($fields["VK_STAMP"], "UTF-8"),   3, "0", STR_PAD_LEFT) . $fields["VK_STAMP"] .      /* 67256 */
        str_pad (mb_strlen($fields["VK_AMOUNT"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_AMOUNT"] .     /* 16.2 */
        str_pad (mb_strlen($fields["VK_CURR"], "UTF-8"),    3, "0", STR_PAD_LEFT) . $fields["VK_CURR"] .       /* EUR */
        str_pad (mb_strlen($fields["VK_REF"], "UTF-8"),     3, "0", STR_PAD_LEFT) . $fields["VK_REF"] .        /* 672564 */
        str_pad (mb_strlen($fields["VK_MSG"], "UTF-8"),     3, "0", STR_PAD_LEFT) . $fields["VK_MSG"] .        /* Order nr. 67256 */
        str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] .     /* https://romet.vm-backend.dev.elkdata.ee/payment/callback/order/bank */
        str_pad (mb_strlen($fields["VK_CANCEL"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_CANCEL"] .     /* https://romet.vm-backend.dev.elkdata.ee/payment/callback/order/bank */
        str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"];    /* 2022-06-22T11:57:11+0300 */
/* $data = "0041012003008009uid1000490056725600416.2003EUR006672564015Order nr. 67256067https://romet.vm-backend.dev.elkdata.ee/payment/callback/order/bank067https://romet.vm-backend.dev.elkdata.ee/payment/callback/order/bank0242022-06-22T11:57:11+0300"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* Gzd3F4q3TMTqTMNscrQACwonSWLu2FmXTO/4AlRivdZembktRmJdKKEdpkCYr8sv9LqR2IjSYQHGaT5FBfAYEXP227gEQOD1SQCaNekTJOrXdshMiJMYXX1fX9XGvSghqx84jEY2IaYGaxcugyQJU+ZC7KRNy694Z2ivZYqSxSWF3SVGUbMPyXf2TK9ctBVdc5f4DAxbHtHJfi9NiCKVqahPZ+VSGEin8BKnZBCxHqWgSy3Dl1PphtwwwEQ9WMr7lOL3VfIWvmNyxulfmzMTBWC9LUce7xkY3xwkkTlzV2dlcDk9dsPwF5xVFczb2h1Ui9FOy/73TyZKElQJW+MRmg== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
        
        Makse teostamise näidisrakendus "LHV"