diff --git a/auth/auth.go b/auth/auth.go
index 22c7409..8330de8 100644
--- a/auth/auth.go
+++ b/auth/auth.go
@@ -1,5 +1,33 @@
 package sharedauth
 
-type InstallId struct {
-	InstallId string
+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 ValidateReq struct {
+	LauncherToken string
+}
+
+type ValidateResp struct {
 }