castle.NewWithHTTPClient("secret-api-key", &http.Client{Timeout: time.Second * 2})

castle.Track(
  castle.EventLoginSucceeded,
  "user-123",
  map[string]string{"prop1": "propValue1"},
  map[string]string{"trait1": "traitValue1"},
  castle.ContextFromRequest(req),
)

castle.Track(
  castle.Event("custom-event"),
  "user-123",
  map[string]string{"prop1": "propValue1"},
  map[string]string{"trait1": "traitValue1"},
  castle.ContextFromRequest(req),
)

decision, err := castle.Authenticate(
  castle.EventLoginSucceeded,
  "md-1",
  map[string]string{"prop1": "propValue1"},
  map[string]string{"trait1": "traitValue1"},
  castle.ContextFromRequest(req),
)

package main

import (
  "net/http"
  "log"
  "github.com/castle/castle-go/castle"
)

func main() {

	cstl, err := castle.New("secret-api-key")

	if err != nil {
		log.Fatal(err)
	}

	http.ListenAndServe(":8080", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

		// authenticate user then track with castle

		decision, err := castle.AuthenticateSimple(
			castle.EventLoginSucceeded,
			"user-123",
			castle.ContextFromRequest(r),
		)

		if err != nil {
			log.Println(err)
		}

		if decision == castle.RecommendedActionChallenge {
			// challenge with MFA and track with castle

			err := cstl.TrackSimple(
				castle.EventChallengeRequested,
				"user-123",
				castle.ContextFromRequest(r),
			)

			if err != nil {
				log.Println(err)
			}

			// trigger off MFA path
		}

		w.WriteHeader(http.StatusNoContent)
	}))

}