"1012",
        "VK_VERSION"     => "008",
        "VK_SND_ID"      => "uid100036",
        "VK_STAMP"       => "151",
        "VK_AMOUNT"      => "30.00",
        "VK_CURR"        => "EUR",
        "VK_REF"         => "1517",
        "VK_MSG"         => "Vaheajatellimus 2110060016 21.10.2021 06:00",
        "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"    => "2021-10-06T09:03:40+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) . $fields["VK_STAMP"] .      /* 151 */
        str_pad (mb_strlen($fields["VK_AMOUNT"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_AMOUNT"] .     /* 30.00 */
        str_pad (mb_strlen($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) . $fields["VK_REF"] .        /* 1517 */
        str_pad (mb_strlen($fields["VK_MSG"], "UTF-8"),     3, "0", STR_PAD_LEFT) . $fields["VK_MSG"] .        /* Vaheajatellimus 2110060016 21.10.2021 06:00 */
        str_pad (mb_strlen($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"];    /* 2021-10-06T09:03:40+0000 */
/* $data = "0041012003008009uid10003600315100530.00003EUR0041517043Vaheajatellimus 2110060016 21.10.2021 06:00057http://127.0.0.1:8000/et/orders/banks/thorbanks_response/057http://127.0.0.1:8000/et/orders/banks/thorbanks_response/0242021-10-06T09:03:40+0000"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* w31h8k0TGyaBDxssmIB+/18b9VbF+4irezqd5Wwt+/+7/9E+arohkIP2fePxvWaVohFmN588MbTSsumo0HspMhY/7f9xbeuEqktEJLpWFXyelVlvIH7yYfKsMuUJ9KqHzrJqzbF4NkhWpgrP5r1RXWLrl5YYi+VYwiWHirsYnboDVa1T6miMDgp3Zs1TEqnB1sqPh+XX4nU73b3HA1AUpMytdb1JOGPwoXr0EKi1fh+NS1kdfNtbGZk5PlybQIBoD4fmwO9MrK+uvki2tO0nqEFLOr4W8zMfF4w+EGiPSGNIkRXO1+AH8qZ2sq1+i6Bp/XsGdsDrt6E6WJXw4kAxyw== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
        
        Makse teostamise näidisrakendus "SEB"