diff --git a/domain/domain.go b/domain/domain.go
new file mode 100644
index 0000000..995b6b5
--- /dev/null
+++ b/domain/domain.go
@@ -0,0 +1,61 @@
+package domain
+
+import (
+	"errors"
+
+	"git.gregbrzezinski.com/Skirda/skirdaGoLauncher/sharedutils/games/skirdagame"
+	"git.gregbrzezinski.com/Skirda/skirdaGoLauncher/sharedutils/skirdasession"
+)
+
+type SkirdaDomain struct {
+	DomainId string
+	skirdagame.SkirdaGames
+	skirdasession.SkirdaSessions
+}
+
+func (domain SkirdaDomain) BuildDomain(newGames []skirdagame.SkirdaGame, newSessions []skirdasession.SkirdaSession) {
+	domain.AddGames(newGames)
+	domain.AddSessions(newSessions)
+}
+
+type Domains []SkirdaDomain
+
+func (domains Domains) Set(newDomains []SkirdaDomain) {
+	domains = append([]SkirdaDomain{}, newDomains...)
+}
+
+func (domains Domains) FindGameByID(gameId string) (skirdagame.SkirdaGame, error) {
+	for _, domain := range domains {
+		game, _ := domain.FindGameByID(gameId)
+		if game.GetSkirdaGameId() == gameId {
+			return game, nil
+		}
+	}
+
+	return nil, errors.New("")
+}
+
+func (domains Domains) GetGames() skirdagame.SkirdaGames {
+	allGames := skirdagame.SkirdaGames{}
+	for _, domain := range domains {
+		allGames = append(allGames, domain.SkirdaGames...)
+	}
+	return allGames
+}
+
+func (domains Domains) GetSessions() skirdasession.SkirdaSessions {
+	plainSessions := skirdasession.SkirdaSessions{}
+	for _, domain := range domains {
+		plainSessions = append(plainSessions, domain.SkirdaSessions...)
+	}
+	return plainSessions
+}
+
+func (domains Domains) FindDomain(domainId string) (SkirdaDomain, error) {
+	for _, domain := range domains {
+		if domain.DomainId == domainId {
+			return domain, nil
+		}
+	}
+	return SkirdaDomain{}, errors.New("not any domain founded")
+}
diff --git a/games/minecraftgame/minecraftgame.go b/games/minecraftgame/minecraftgame.go
new file mode 100644
index 0000000..1a91372
--- /dev/null
+++ b/games/minecraftgame/minecraftgame.go
@@ -0,0 +1,27 @@
+package minecraftgame
+
+import "git.gregbrzezinski.com/Skirda/skirdaGoLauncher/sharedutils/games/skirdagame"
+
+const gameType = "minecraft"
+
+type MinecraftGame struct {
+	SkirdaGameId string
+	Assets       skirdagame.GameUIAssets
+	// CurrentVersion string
+}
+
+func (game MinecraftGame) GetSkirdaGameId() string {
+	return game.SkirdaGameId
+}
+
+func (game MinecraftGame) GetInterfaceAsset() skirdagame.GameUIAssets {
+	return game.Assets
+}
+
+func (game MinecraftGame) GetLaunchArgs() []string {
+	return []string{"", ""}
+}
+
+func (game MinecraftGame) GetType() string {
+	return gameType
+}
diff --git a/games/skirdagame/skirdagame.go b/games/skirdagame/skirdagame.go
new file mode 100644
index 0000000..af6909c
--- /dev/null
+++ b/games/skirdagame/skirdagame.go
@@ -0,0 +1,32 @@
+package skirdagame
+
+import "errors"
+
+type SkirdaGame interface {
+	GetSkirdaGameId() string
+	GetInterfaceAsset() GameUIAssets
+	GetLaunchArgs() []string
+	GetType() string
+}
+
+type GameUIAssets struct {
+	// GameID      string `json:"gameId"`
+	Title       string `json:"title"`
+	Icon        string `json:"icon"`
+	Description string `json:"description"`
+}
+
+type SkirdaGames []SkirdaGame
+
+func (games SkirdaGames) AddGames(game []SkirdaGame) {
+	games = append(games, game...)
+}
+
+func (games SkirdaGames) FindGameByID(gameId string) (SkirdaGame, error) {
+	for _, game := range games {
+		if game.GetSkirdaGameId() == gameId {
+			return game, nil
+		}
+	}
+	return nil, errors.New("")
+}
diff --git a/games/steamgame/steamgame.go b/games/steamgame/steamgame.go
new file mode 100644
index 0000000..9fd0dc7
--- /dev/null
+++ b/games/steamgame/steamgame.go
@@ -0,0 +1,28 @@
+package steamgame
+
+import "git.gregbrzezinski.com/Skirda/skirdaGoLauncher/sharedutils/games/skirdagame"
+
+const gameType = "steam"
+
+type SteamGame struct {
+	SkirdaGameId string
+	SteamId      string
+	Assets       skirdagame.GameUIAssets
+	// CurrentVersion string
+}
+
+func (game SteamGame) GetSkirdaGameId() string {
+	return game.SkirdaGameId
+}
+
+func (game SteamGame) GetInterfaceAsset() skirdagame.GameUIAssets {
+	return game.Assets
+}
+
+func (game SteamGame) GetLaunchArgs() []string {
+	return []string{"", ""}
+}
+
+func (game SteamGame) GetType() string {
+	return gameType
+}
diff --git a/sharedauth/sharedauth.go b/sharedauth/sharedauth.go
new file mode 100644
index 0000000..be7c0ba
--- /dev/null
+++ b/sharedauth/sharedauth.go
@@ -0,0 +1,37 @@
+package sharedauth
+
+import "time"
+
+type InstallIdRegisterReq struct {
+	InstallId InstallId
+}
+
+type InstallId string
+
+func (id InstallId) Validate() bool {
+	//TODO: More checks
+	return id != ""
+}
+
+type RedirResp struct {
+	RedirectUrl string
+}
+
+type LauncherSession struct {
+	// Username string
+	// DiscordId    string
+	SessionToken string
+	InstallId    string
+	Expiry       time.Time
+}
+
+type ProfileResp struct {
+	Username string
+}
+
+type ValidateReq struct {
+	LauncherToken string
+}
+
+type ValidateResp struct {
+}
diff --git a/skirdasession/skirdasession.go b/skirdasession/skirdasession.go
new file mode 100644
index 0000000..b85a63d
--- /dev/null
+++ b/skirdasession/skirdasession.go
@@ -0,0 +1,103 @@
+package skirdasession
+
+import (
+	"errors"
+)
+
+type SkirdaSession interface {
+	GetSessionId() string
+	GetGameId() string
+	GetUIAssets() SessionUIAssets
+	GetGameType() string
+	GetSessionData() string
+}
+
+// type SkirdaSession struct {
+// 	SkirdaSessionId string
+// 	SkirdaGameId    string
+// 	Assets          SessionUIAssets
+// }
+
+type SkirdaSessions []SkirdaSession
+
+type SessionUIAssets struct {
+	// GameID      string `json:"gameId"`
+	Title       string `json:"title"`
+	Icon        string `json:"icon"`
+	Description string `json:"description"`
+}
+
+func (sessions SkirdaSessions) FindSessionById(sessionId string) (SkirdaSession, error) {
+	for _, session := range sessions {
+		if session.GetSessionId() == sessionId {
+			return session, nil
+		}
+	}
+	return nil, errors.New("no any sessions founded")
+}
+
+func (sessions SkirdaSessions) AddSessions(newSessions []SkirdaSession) {
+	sessions = append(sessions, newSessions...)
+}
+
+type MinecraftSession struct {
+	SkirdaSessionId string
+	SkirdaGameId    string
+	Assets          SessionUIAssets
+	Version         string
+}
+
+func (session MinecraftSession) GetSessionId() string {
+	return session.SkirdaSessionId
+}
+
+func (session MinecraftSession) GetUIAssets() SessionUIAssets {
+	return session.Assets
+}
+
+func (session MinecraftSession) GetGameId() string {
+	return session.SkirdaGameId
+}
+
+func (session MinecraftSession) GetMinecraftVersion() string {
+	return session.SkirdaGameId
+}
+
+func (session MinecraftSession) GetGameType() string {
+	return "minecraft"
+}
+
+func (session MinecraftSession) GetSessionData() string {
+	return session.Version
+}
+
+type SteamSession struct {
+	SkirdaSessionId string
+	SkirdaGameId    string
+	Assets          SessionUIAssets
+	// Data            SteamSessionData
+}
+
+type SteamSessionData struct {
+	kke string
+}
+
+func (session SteamSession) GetSessionId() string {
+	return session.SkirdaSessionId
+}
+
+func (session SteamSession) GetUIAssets() SessionUIAssets {
+	return session.Assets
+}
+
+func (session SteamSession) GetGameId() string {
+	return session.SkirdaGameId
+}
+
+func (session SteamSession) GetGameType() string {
+	return "steam"
+}
+
+func (session SteamSession) GetSessionData() string {
+	return ""
+}