/// <summary>
/// Get Headers with Bearer Token
/// </summary>
/// <param name="authenticationHelper"></param>
/// <param name="settings"></param>
/// <returns></returns>
public static async Task <Dictionary <string, List <string> > > GetHttpRequestHeaders(this IAuthenticationHelper authenticationHelper, AuthenticationHelperSettings settings)
{
var headers = new Dictionary <string, List <string> >();
var authenticationResult = await authenticationHelper
.AcquireTokenAsync(settings)
.ConfigureAwait(false);
headers.AddAuthorizationHeader(authenticationResult.AccessTokenType, authenticationResult.AccessToken);
return(headers);
}