"1011",
        "VK_VERSION"     => "008",
        "VK_SND_ID"      => "uid100052",
        "VK_STAMP"       => "12345",
        "VK_AMOUNT"      => "150",
        "VK_CURR"        => "EUR",
        "VK_ACC"         => "EE152200221234567897",
        "VK_NAME"        => "ÕIE MÄGER",
        "VK_REF"         => "1234561",
        "VK_LANG"        => "EST",
        "VK_MSG"         => "Torso Tiger",
        "VK_RETURN"      => "https://banks.pastel.thorgate.eu/project/sjZfG6RrKJT4YbY5?payment_action=success",
        "VK_CANCEL"      => "https://banks.pastel.thorgate.eu/project/sjZfG6RrKJT4YbY5?payment_action=cancel",
        "VK_DATETIME"    => "2025-11-01T11:11:10+0000",
        "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) . $fields["VK_SERVICE"] .    /* 1011 */
        str_pad (mb_strlen($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) . $fields["VK_STAMP"] .      /* 12345 */
        str_pad (mb_strlen($fields["VK_AMOUNT"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_AMOUNT"] .     /* 150 */
        str_pad (mb_strlen($fields["VK_CURR"], "UTF-8"),    3, "0", STR_PAD_LEFT) . $fields["VK_CURR"] .       /* EUR */
        str_pad (mb_strlen($fields["VK_ACC"], "UTF-8"),     3, "0", STR_PAD_LEFT) . $fields["VK_ACC"] .        /* EE152200221234567897 */
        str_pad (mb_strlen($fields["VK_NAME"], "UTF-8"),    3, "0", STR_PAD_LEFT) . $fields["VK_NAME"] .       /* ÕIE MÄGER */
        str_pad (mb_strlen($fields["VK_REF"], "UTF-8"),     3, "0", STR_PAD_LEFT) . $fields["VK_REF"] .        /* 1234561 */
        str_pad (mb_strlen($fields["VK_MSG"], "UTF-8"),     3, "0", STR_PAD_LEFT) . $fields["VK_MSG"] .        /* Torso Tiger */
        str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] .     /* https://banks.pastel.thorgate.eu/project/sjZfG6RrKJT4YbY5?payment_action=success */
        str_pad (mb_strlen($fields["VK_CANCEL"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_CANCEL"] .     /* https://banks.pastel.thorgate.eu/project/sjZfG6RrKJT4YbY5?payment_action=cancel */
        str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"];    /* 2025-11-01T11:11:10+0000 */
/* $data = "0041011003008009uid10005200512345003150003EUR020EE152200221234567897009ÕIE MÄGER0071234561011Torso Tiger080https://banks.pastel.thorgate.eu/project/sjZfG6RrKJT4YbY5?payment_action=success079https://banks.pastel.thorgate.eu/project/sjZfG6RrKJT4YbY5?payment_action=cancel0242025-11-01T11:11:10+0000"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* NRDEVEwXHj3MqHWvQP36sd2hK99ngHG68E0wPK+xW7zEaTwOBqSrue8ETkw+wm4hPJVxNo1x+anK91AEDn/OGnK5m2WXMpjwtEDXNHmjeGCzrh5lhbzReC2S9dcdn4mCYQAQHoEZ5hI7lbjCeYdEBIWsj0QefKbz9ZUgaSiaIvMBj7CI/YTpjTqw1zKW58sZC9wfuAZz16MR1HPMoi2gYfDzHCnLoUJtWAZW1IA6vYgIdgDwmK/MLc+Errsd/sGxZr+GkCv2oZRHNC8AqerevyLu746pHkUqEsHgnEJmlv+9CXO7cRD6SQYuHAY4j0reUOrj9g8pAQNZ2hKDhcWOvA== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
        
        Makse teostamise näidisrakendus "Swedbank"