Initialize struct with options

helseid, err := helseid.NewHelseID(&Options{
	Config: Config{
		BaseUrl:     "https://helseid-sts.test.nhn.no",
		ApiScopes:    []string{"wch:skjerm-api/test"}
		ClientID:    "",
		RedirectUri: "http://localhost:8080/callback",
		PrivateKey:  your-privatekey-jwk,
	},
	HttpClient:    	   nil,
	SigningMethod: 	   nil,
})

Authorization flow

func requestHandler(hid *helseid.HelseID) http.Handler {
	router := http.NewServeMux()

	router.Handle("GET /login", helseid.AuthorizationHandler(false, nil))

	router.Handle("GET /callback", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { // Landingpage specified in the redirecturl
		tokenResponse, err := helseid.NewAuthorizationToken(r)
		if err != nil {
			http.Error(w, err.Error(), http.StatusUnauthorized)
			return
		}
		// Set cookie to manage the refreshtoken lifetime if needed
		http.SetCookie(w, tokenResponse.NewCookie())

		w.Write([]byte("ok"))
	}))

	return router
}

Client credentials flow (example)

func printToken(hid *helseid.HelseID) {
	tokenResponse, err := hid.NewClientCredentialToken(nil)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(tokenResponse.AccessToken)
}