"4011",
        "VK_VERSION"     => "008",
        "VK_SND_ID"      => "uid100052",
        "VK_REPLY"       => "3012",
        "VK_RETURN"      => "https://banks.pastel.thorgate.eu/project/sjZfG6RrKJT4YbY5?auth_action=success",
        "VK_DATETIME"    => "2025-10-31T07:11:26+0000",
        "VK_RID"         => "1761894686585",
        "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) . $fields["VK_SERVICE"] .    /* 4011 */
        str_pad (mb_strlen($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) . $fields["VK_SND_ID"] .     /* uid100052 */
        str_pad (mb_strlen($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) . $fields["VK_RETURN"] .     /* https://banks.pastel.thorgate.eu/project/sjZfG6RrKJT4YbY5?auth_action=success */
        str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"] .   /* 2025-10-31T07:11:26+0000 */
        str_pad (mb_strlen($fields["VK_RID"], "UTF-8"),     3, "0", STR_PAD_LEFT) . $fields["VK_RID"];         /* 1761894686585 */
/* $data = "0044011003008009uid1000520043012077https://banks.pastel.thorgate.eu/project/sjZfG6RrKJT4YbY5?auth_action=success0242025-10-31T07:11:26+00000131761894686585"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* jVhCZLH7+B3UfV13SuSnUK3kQznxvV1s0xp4J5+XoAdFEPl3EEc3yhyI2gyZ2zkZbqGJkytZzIIw/ldZ2ZmsbkAv39aLY+07gVAUFAemgvpXS0J60B0t/RplTXsQ+2JoiY25DXcUdxA0cH+r80K8iNgohokdad13ZFqqnvGkM7jhnZm6B2IOhKvkTwgoI5MeJJGFDX4HDFaAJltQb2ca+jpxDocz8uPuUGe7QbHJv+MlONGXseYQNdJU3HouQ84Cp0vfyQJ53FsZK9W2XGfSPr4hAR87u1c6IuXx0cGhIILfym7chXtfJJ0k9ZuCjYlxm7mZMPzvy/8TVs3j4d9RFQ== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
        
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