JFIFxxC      C  " }!1AQa"q2#BR$3br %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz w!1AQaq"2B #3RbrtoPKIRequestString() : ''; $hashStr = $apiKey . $randomString . $secretKey . $pKIRequestString; return base64_encode(sha1($hashStr, true)); } }