private var _twitauth:OAuthManager = new OAuthManager();
_twitauth.addEventListener( OAuthEvent.ON_REQUEST_TOKEN_RECEIVED, onRequestTokenReceived );
_twitauth.addEventListener( OAuthEvent.ON_REQUEST_TOKEN_FAILED, onRequestTokenFailed );
_twitauth.addEventListener( OAuthEvent.ON_ACCESS_TOKEN_RECEIVED, onAccessTokenReceived );
_twitauth.addEventListener( OAuthEvent.ON_ACCESS_TOKEN_FAILED, onAccessTokenFailed );
_twitauth.usePinWorkflow = true;
_twitauth.consumerKey = key.text;   // Your application key from your twitter.com settings page
_twitauth.consumerSecret = secret.text;   // Your application secret from your twitter.com settings page
_twitauth.oauthDomain = "twitter.com";
_twitauth.requestToken();

// callback for "requestToken()" when request token received from twitter
private function onRequestTokenReceived( evt:OAuthEvent ):void
{
	// This will redirect to a web page which allows users to accept and receive a pin number
	// Normally might be best to display an alert warning user that they will get a web page
	// displayed and what they should do with it
	_twitauth.requestAuthorisation();
}

// call this method after getting the user to enter the pin number displayed on screen
private function onSendPin():void
{
	if( pin.text.length != 7 )
	{
		Alert.show( "Sorry the PIN number is incorrect, it must be 7 numbers", "Approve Application", Alert.OK );
		return;
	}

	if( !_twitauth.validatePin( pin.text ) )
	{
		Alert.show( "Sorry the PIN number is invalid and must have been typed incorrectly", "Approve Application", Alert.OK );
		return;
	}

	_twitauth.requestAccessToken( Number( pin.text ) );
}

private function onAccessTokenReceived( evt:OAuthEvent ):void
{
	// Store pins and tokens ready for future requests ... might even be good to confirm
	// the customerName is what you were expected for this authorisation
	accessPin = _twitauth.accessPin;
	accessToken = _twitauth.accessToken;
	accessTokenSecret = _twitauth.accessTokenSecret;
	customerName = _twitauth.currentUserName;

	// Now I can do my tweets and whatever
	// ........
}

private var accessPin:Number;
private var accessToken:String;
private var accessTokenSecret:String;
private var customerName:String;

var twitauth:OAuthManager = new OAuthManager();
twitauth.usePinWorkflow = true;
// The following variables are retrieved from where there were stored when first authorised using step 1
twitauth.accessPin = accessPin;
twitauth.accessToken = accessToken;
twitauth.accessTokenSecret = accessTokenSecret;
twitauth.consumerKey = applicationConsumerKey;
twitauth.consumerSecret = applicationConsumerSecret;
twitauth.oauthDomain = "twitter.com";

// Get our signed data using above keys, ready for sending to twitter
var postData:String = twitauth.getSignedURI( "POST", "http://twitter.com/statuses/update.xml", "status=" + encodeURIComponent(tweet.text) );

// Setup our request to twitter using signed information
var httpService:HTTPService = new HTTPService;
httpService.url = "http://twitter.com/statuses/update.xml";
httpService.useProxy = false;
httpService.method = "POST";
httpService.contentType = "application/x-www-form-urlencoded";
httpService.addEventListener( "result", httpPostResult );
httpService.addEventListener( "fault", httpPostFault );
httpService.send( new QueryString( postData ).toPostObject() );