"1012",
        "VK_VERSION"     => "008",
        "VK_SND_ID"      => "uid100036",
        "VK_STAMP"       => "2909134",
        "VK_AMOUNT"      => "8.7",
        "VK_CURR"        => "EUR",
        "VK_REF"         => "29091346",
        "VK_MSG"         => "Pangalink: 2909134",
        "VK_RETURN"      => "https://vm-backend.dev.elkdata.ee/payment/callback/order/bank",
        "VK_CANCEL"      => "https://vm-backend.dev.elkdata.ee/payment/callback/order/bank",
        "VK_DATETIME"    => "2024-03-12T13:12:05+0200",
        "VK_LANG"        => "EST",
        "VK_ACC"         => "EE171010123456789017",
        "VK_NAME"        => "Veebimajutus",
        "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) . $fields["VK_STAMP"] .      /* 2909134 */
        str_pad (mb_strlen($fields["VK_AMOUNT"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_AMOUNT"] .     /* 8.7 */
        str_pad (mb_strlen($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) . $fields["VK_REF"] .        /* 29091346 */
        str_pad (mb_strlen($fields["VK_MSG"], "UTF-8"),     3, "0", STR_PAD_LEFT) . $fields["VK_MSG"] .        /* Pangalink: 2909134 */
        str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] .     /* https://vm-backend.dev.elkdata.ee/payment/callback/order/bank */
        str_pad (mb_strlen($fields["VK_CANCEL"], "UTF-8"),  3, "0", STR_PAD_LEFT) . $fields["VK_CANCEL"] .     /* https://vm-backend.dev.elkdata.ee/payment/callback/order/bank */
        str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"];    /* 2024-03-12T13:12:05+0200 */
/* $data = "0041012003008009uid10003600729091340038.7003EUR00829091346018Pangalink: 2909134061https://vm-backend.dev.elkdata.ee/payment/callback/order/bank061https://vm-backend.dev.elkdata.ee/payment/callback/order/bank0242024-03-12T13:12:05+0200"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* YQa9xtG+tZkoI1WkGtgyHs//WBU620QgA77gdYyktnxt2I2ISfmml4rIBh5kGbLl+qZFU9mwwolWlBH6ZF5rdsJD07oG0srF1a6D9qkh1r9BtoGWb8NnXsJDUWCJ4GH+kyQ2cpXddwXfHq2vOWY9tz8xhhUhPh9MNVDnRVGIM5cUN4t+XCwPSSEef++rNhcIbJH6DSOqc9ovkr/uAh3LecUZ3amX3nuly4irCk669fTjQ0ATAwWPmEJWzlf3MTOx/cT8COVAOOO5yFlRhi7POwV7hhPa8uEeSn9HZ9Qsflr+8gAI3jja7ttAG4RZGcx2Apoi2PQPBPpPg7ufAh2+tA== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
        
        Makse teostamise näidisrakendus "SEB"