Retrieve PayPal Access Token via HTTP Request

gistfile1.txt

    func httpRequestAccessToken()
    {
        //Concatenate a String composed of the client and secret id's
        let authString = "\(kClientIdSandbox):\(kSecretId)"
        let authData = authString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)
        let credentials = "Basic \(authData!.base64EncodedStringWithOptions(nil))"

        //Create and set configuration object with necessary Header and value parameters
        let configuration = NSURLSessionConfiguration.defaultSessionConfiguration()
        configuration.HTTPAdditionalHeaders = ["Accept": "application/json", "Accept-Language": "en_US", "Content-Type": "application/x-www-form-urlencoded", "Authorization": credentials]

        //Create session
        let session = NSURLSession(configuration: configuration)

        //Create request
        let request = NSMutableURLRequest(URL: NSURL(string: "https://api.sandbox.paypal.com/v1/oauth2/token")!)
        request.HTTPMethod = "POST"

        //Create data for request
        let dataString = "grant_type=client_credentials"
        let theData = dataString.dataUsingEncoding(NSASCIIStringEncoding, allowLossyConversion: true)

        //Creates an HTTP request for the specified URL request object, uploads the provided data object, and calls a handler upon completion.
        let task = session.uploadTaskWithRequest(request, fromData: theData) { (data, response, error) -> Void in
            if error != nil
            {
                println(error.localizedDescription)
            }
            else
            {
                println("data = \(NSJSONSerialization.JSONObjectWithData(data, options: nil, error: nil)!)")
            }
        }
        task.resume()
    }