OAuth2 Refresh Token

To refresh an access token, the OAuth/Token service can be used, as described in the API documentation. In addition to the access token, this service also returns a new refresh token. The refresh token does not have an infinite validity, so it is wise to replace the old refresh token with the new one as soon as possible. Should the refresh token expire, the service will return a bad-request (Http statuscode 400) error, and the user will have to log in again.

Use of this service requires the following data:

client_id / client_secretUsed to identify the client application. A software partner can obtain this by contacting 2BA.
refresh_tokenThe refresh token retrieved earlier by using one of the two OAuth flows.

Example usage of the Refesh Token

private void BtnRefreshAccesTokenClick(object sender, EventArgs e)
		var httpWReq = (HttpWebRequest)WebRequest.Create(GlobalVariables.AuthorizeServer + "/OAuth/Token");
		var encoding = new ASCIIEncoding();
		var postData = "grant_type=refresh_token";
		postData += "&refresh_token=" + txtRefreshToken.Text;
		postData += "&client_id=" + txtClientId.Text;
		postData += "&client_secret=" + txtClientSecret.Text;
		var data = encoding.GetBytes(postData);
		httpWReq.Method = "POST";
		httpWReq.ContentType = "application/x-www-form-urlencoded";
		httpWReq.ContentLength = data.Length;
		HttpWebResponse response;
		using (Stream newStream = httpWReq.GetRequestStream())
			newStream.Write(data, 0, data.Length);
			response = (HttpWebResponse)httpWReq.GetResponse();
		var mystream = response.GetResponseStream();
		XmlReader reader = JsonReaderWriterFactory.CreateJsonReader(mystream, new XmlDictionaryReaderQuotas());
		var root = XElement.Load(reader);
		// The fields we'd like to extract
		var accessToken = root.XPathSelectElement("//access_token");
		var refreshToken = root.XPathSelectElement("//refresh_token");
		var expiresIn = root.XPathSelectElement("//expires_in");
		txtAccessToken.Text = (accessToken == null) ? null : accessToken.Value;
		txtRefreshToken.Text = (refreshToken == null) ? null : refreshToken.Value;
		txtExpiresIn.Text = (expiresIn == null) ? null : expiresIn.Value;
	catch (Exception ex)
		MessageBox.Show(@"Refresh AccessToken failed: " + ex.Message);
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