$input = $request->all();
ksort($input, SORT_STRING);

$dataReturn = array();
foreach ($input as $key => $value) {
    if ($key === "x_signature") {
        continue;
    }
    $dataReturn[] = $key.$value;

}

$preparedString = implode('|', $dataReturn);

$hashString = hash_hmac('sha256', $preparedString, "S-g-hkTrTOLdBE2_AQVcUxtA");