"1012",
"VK_VERSION" => "008",
"VK_SND_ID" => "uid100052",
"VK_STAMP" => "2909041",
"VK_AMOUNT" => "10.68",
"VK_CURR" => "EUR",
"VK_REF" => "29090415",
"VK_MSG" => "Pangalink: 2909041",
"VK_RETURN" => "http://localhost/payment/callback/order/bank",
"VK_CANCEL" => "http://localhost/payment/callback/order/bank",
"VK_DATETIME" => "2023-09-22T17:34:55+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! 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) . $fields["VK_STAMP"] . /* 2909041 */
str_pad (mb_strlen($fields["VK_AMOUNT"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_AMOUNT"] . /* 10.68 */
str_pad (mb_strlen($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) . $fields["VK_REF"] . /* 29090415 */
str_pad (mb_strlen($fields["VK_MSG"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_MSG"] . /* Pangalink: 2909041 */
str_pad (mb_strlen($fields["VK_RETURN"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_RETURN"] . /* http://localhost/payment/callback/order/bank */
str_pad (mb_strlen($fields["VK_CANCEL"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_CANCEL"] . /* http://localhost/payment/callback/order/bank */
str_pad (mb_strlen($fields["VK_DATETIME"], "UTF-8"), 3, "0", STR_PAD_LEFT) . $fields["VK_DATETIME"]; /* 2023-09-22T17:34:55+0300 */
/* $data = "0041012003008009uid100052007290904100510.68003EUR00829090415018Pangalink: 2909041044http://localhost/payment/callback/order/bank044http://localhost/payment/callback/order/bank0242023-09-22T17:34:55+0300"; */
// STEP 4. Sign the data with RSA-SHA1 to generate MAC code
// ========================================================
openssl_sign ($data, $signature, $private_key, OPENSSL_ALGO_SHA1);
/* MSWls4StBA4rhyrKC2ttm4rzM34Q7FPhdIHlMZuMqWucdnm2sCKW0XyBQD9UgD0rrR+vTjo5jTVKVYAUTHGFT7yV3KXG5WyNKgA8tbQfdYywbx6S1NSjrpKl8i5Dmbcxq8+7dAN3BxuQKJrZqk1iIdE4x6mpjRrHI9b4mJivgkMAhVtUQbkxvSUMLDie36givzk4rxJ6aoUHu8HYS7VuXCyj2K2U+xKms4Cede4SWoomTLwBBGHrZad5U9s+UJDii4lu2ARFY0HktRhDX8HRTBUDBj9E+MYiBMR/M9K9FzGi/wZJdNMqD+eREhw/v/nNbwim9itayvVGYdbyVV0VWg== */
$fields["VK_MAC"] = base64_encode($signature);
// STEP 5. Generate POST form with payment data that will be sent to the bank
// ==========================================================================
?>
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