"1012",
"VK_VERSION" => "008",
"VK_SND_ID" => "uid100049",
"VK_STAMP" => "67254",
"VK_AMOUNT" => "129.3",
"VK_CURR" => "EUR",
"VK_REF" => "672548",
"VK_MSG" => "Order nr. 67254",
"VK_RETURN" => "https://romet.vm-backend.dev.elkdata.ee/payment/callback/order/bank",
"VK_CANCEL" => "https://romet.vm-backend.dev.elkdata.ee/payment/callback/order/bank",
"VK_DATETIME" => "2022-06-22T10:51:29+0300",
"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! LHV 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) . $fields["VK_SND_ID"] . /* uid100049 */
str_pad (mb_strlen($fields["VK_STAMP"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_STAMP"] . /* 67254 */
str_pad (mb_strlen($fields["VK_AMOUNT"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_AMOUNT"] . /* 129.3 */
str_pad (mb_strlen($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) . $fields["VK_REF"] . /* 672548 */
str_pad (mb_strlen($fields["VK_MSG"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_MSG"] . /* Order nr. 67254 */
str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] . /* https://romet.vm-backend.dev.elkdata.ee/payment/callback/order/bank */
str_pad (mb_strlen($fields["VK_CANCEL"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_CANCEL"] . /* https://romet.vm-backend.dev.elkdata.ee/payment/callback/order/bank */
str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"]; /* 2022-06-22T10:51:29+0300 */
/* $data = "0041012003008009uid10004900567254005129.3003EUR006672548015Order nr. 67254067https://romet.vm-backend.dev.elkdata.ee/payment/callback/order/bank067https://romet.vm-backend.dev.elkdata.ee/payment/callback/order/bank0242022-06-22T10:51:29+0300"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* Kg39tq5rsUqfuLBfvt+bey8VX/PNfRbFo5Mjlp7v2E5R7oEtQmQjGvsfobEd8GUW8VJN0SaivMB1MCVw690CV4zDOleAJZe/JcEqoX0okYq1AJOAgUC8RiPhMXdogC9ypcT6fPKoVQKW6ruZpOX3/mik9JwcY3n47c1N3fbVNqKHnCd0sF8iNfNiesFVXG9BBv+95boExCLXg+iqAimy7W7gt2CkJdOkjzMpl7svnYWhp3HnKESdoW7O3Q0V/1/fCdsxXux0Y8YcAYuM8oDSzzORVLgAHTU80Y36B5jg9yJnSvB90a0R30RKeVU5NTUkhImn4lDIZJjHgK/8rVwo6A== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
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