https://learn.microsoft.com/en-us/dotnet/api/system.identitymodel.selectors.securitytokenprovider.begingettoken?view=netframework-4.8.1&viewFallbackFrom=net-10.0-pp
SecurityTokenProvider.BeginGetToken(TimeSpan, AsyncCallback, Object) Method...
Begins an asynchronous operation to get a security token.
timespanobjectmethod