.net - Passing user_id from back-end to client-side with Segment Analytics.NET and Mixpanel -

i using c# .net, angularjs , other technology quite loosely coupled. need implement segment , mixpanel. have implemented alias , identify in back-end upon registration , login respectively. put track, page calls required.

i need pass user_id client side on login pass value each event required in documentation. (how connect segment.io server , client side events same anonymous user?) quite close need, , did not work me.

the point here need anyway pass userid identify call on login both back-end , front-end libraries. should regardless of alias call. in accord segment support responses.