private static function _defaultHeaders($apiKey) { $appInfo = Stripe::getAppInfo(); $uaString = 'Stripe/v1 PhpBindings/' . Stripe::VERSION; $langVersion = phpversion(); $uname = php_uname(); $curlVersion = curl_version(); $appInfo = Stripe::getAppInfo(); $ua = array('bindings_version' => Stripe::VERSION, 'lang' => 'php', 'lang_version' => $langVersion, 'publisher' => 'stripe', 'uname' => $uname, 'httplib' => 'curl ' . $curlVersion['version'], 'ssllib' => $curlVersion['ssl_version']); if ($appInfo !== null) { $uaString .= ' ' . self::_formatAppInfo($appInfo); $ua['application'] = $appInfo; } $defaultHeaders = array('X-Stripe-Client-User-Agent' => json_encode($ua), 'User-Agent' => $uaString, 'Authorization' => 'Bearer ' . $apiKey); return $defaultHeaders; }