"1012",
        "VK_VERSION"     => "008",
        "VK_SND_ID"      => "uid100036",
        "VK_STAMP"       => "199",
        "VK_AMOUNT"      => "15.00",
        "VK_CURR"        => "EUR",
        "VK_REF"         => "1999",
        "VK_MSG"         => "Vaheajatellimus 2109270006 21.10.2021 12:00",
        "VK_RETURN"      => "http://127.0.0.1:8000/et/orders/banks/thorbanks_response/",
        "VK_CANCEL"      => "http://127.0.0.1:8000/et/orders/banks/thorbanks_response/",
        "VK_DATETIME"    => "2021-09-27T09:31:55+0000",
        "VK_LANG"        => "EST",
        "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) . $fields["VK_SERVICE"] .    /* 1012 */
        str_pad (mb_strlen($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) . $fields["VK_SND_ID"] .     /* uid100036 */
        str_pad (mb_strlen($fields["VK_STAMP"], "UTF-8"),   3, "0", STR_PAD_LEFT) . $fields["VK_STAMP"] .      /* 199 */
        str_pad (mb_strlen($fields["VK_AMOUNT"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_AMOUNT"] .     /* 15.00 */
        str_pad (mb_strlen($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) . $fields["VK_REF"] .        /* 1999 */
        str_pad (mb_strlen($fields["VK_MSG"], "UTF-8"),     3, "0", STR_PAD_LEFT) . $fields["VK_MSG"] .        /* Vaheajatellimus 2109270006 21.10.2021 12:00 */
        str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] .     /* http://127.0.0.1:8000/et/orders/banks/thorbanks_response/ */
        str_pad (mb_strlen($fields["VK_CANCEL"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_CANCEL"] .     /* http://127.0.0.1:8000/et/orders/banks/thorbanks_response/ */
        str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"];    /* 2021-09-27T09:31:55+0000 */
/* $data = "0041012003008009uid10003600319900515.00003EUR0041999043Vaheajatellimus 2109270006 21.10.2021 12:00057http://127.0.0.1:8000/et/orders/banks/thorbanks_response/057http://127.0.0.1:8000/et/orders/banks/thorbanks_response/0242021-09-27T09:31:55+0000"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* lduENdx/QUm8IGI4yzKZU4yyCHD4bJP5D22D0H2EM/pWyg7kuV8NcerKQoaJy3opkkLDIqowwRAAHGebV63dlY8/Zmwz9ZzQW4F7a96c5gPsOVxvRyUmQ+TgFia9+gTPmYfPahEtYO8KwpJjrA5m76VWF/wccFJV+NIVHxS0V/VvL0XmdrtpWFM7TR8f27aObHmEAQxBIlOtKf2MYIEW9bei/zeStYfcaN+HEKszZ6NkQA6peFmyZA+REQ+pVrrVThU4YXW7Ja+eRNkWWuE80iHhexV/6SZOXevPAYCFBN92/3QCA7LdR1Y6n3Nh6+f1qxn7GxxF8pn1VkEFhkJqFA== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
        
        Makse teostamise näidisrakendus "SEB"