"1012",
        "VK_VERSION"     => "008",
        "VK_SND_ID"      => "uid100052",
        "VK_STAMP"       => "62",
        "VK_AMOUNT"      => "15.00",
        "VK_CURR"        => "EUR",
        "VK_REF"         => "628",
        "VK_MSG"         => "Ref. 2101040002",
        "VK_RETURN"      => "https://opera.odin.thorgate.eu/en/orders/banks/thorbanks_response/",
        "VK_CANCEL"      => "https://opera.odin.thorgate.eu/en/orders/banks/thorbanks_response/",
        "VK_DATETIME"    => "2021-01-04T08:26:58+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! Swedbank 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) . $fields["VK_SND_ID"] .     /* uid100052 */
        str_pad (mb_strlen($fields["VK_STAMP"], "UTF-8"),   3, "0", STR_PAD_LEFT) . $fields["VK_STAMP"] .      /* 62 */
        str_pad (mb_strlen($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) . $fields["VK_REF"] .        /* 628 */
        str_pad (mb_strlen($fields["VK_MSG"], "UTF-8"),     3, "0", STR_PAD_LEFT) . $fields["VK_MSG"] .        /* Ref. 2101040002 */
        str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] .     /* https://opera.odin.thorgate.eu/en/orders/banks/thorbanks_response/ */
        str_pad (mb_strlen($fields["VK_CANCEL"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_CANCEL"] .     /* https://opera.odin.thorgate.eu/en/orders/banks/thorbanks_response/ */
        str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"];    /* 2021-01-04T08:26:58+0000 */
/* $data = "0041012003008009uid1000520026200515.00003EUR003628015Ref. 2101040002066https://opera.odin.thorgate.eu/en/orders/banks/thorbanks_response/066https://opera.odin.thorgate.eu/en/orders/banks/thorbanks_response/0242021-01-04T08:26:58+0000"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* EdA93zg+cfHidQtjcKsWpQDJuiLVv/vBwdzL0+z1DHSYBjSqK5t8A0b53uVaVvyI9kYOOptrBohzVFXwkw1atyrmvyngkc1os19YnK3yPk7hxnm52Db0ogXHXy//eCYPsA36FHLuJQKyQszVkm7JXS8FYbZr44BiV5sRpeeyhTCoSo/NYPFoziTTmWHewh5kEtE4GHmkTu+7UkfLtq+ladzdkkZv4pw7vtQ1QkhVryfcgA+35gh9ErT7U9dLzBiQWp5QCwc8jreJql3sihi9+uTliuzh8oLQoyobu8nPgL4C/8K9GC2hiA1pAVzVMVVjhFNkPsZPY7nve2J4fhuONA== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
        
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