/// <summary>
/// Request access token for an app key, client secret and authorization code
/// </summary>
/// <param name="httpContext">current application context</param>
/// <param name="code">authorization code</param>
/// <returns>access token</returns>
public static string GetAccessTokenByCode(HttpContext httpContext, string code)
{
var webForm = new AuthenticationWebPage(httpContext, null);
return webForm.GetAccessTokenByCode(code);
}
/// <summary>
/// Sends an authorization request to Constant Contact API
/// (if access to application is granted, a code is send to Redirect URL field)
/// (Redirect URL is one of web application url pages/methods)
/// </summary>
/// <param name="httpContext">current application context</param>
/// <param name="state">state query parameter</param>
public static void AuthorizeFromWebApplication(HttpContext httpContext, string state)
{
var webForm = new AuthenticationWebPage(httpContext, state);
webForm.GetAuthorizationCode();
}