diff --git a/app/app.go b/app/app.go
index df11f59..c1a1224 100644
--- a/app/app.go
+++ b/app/app.go
@@ -25,6 +25,9 @@ const (
 	InvalidRequest   string = "invalid_request"
 	MalformedJSON    string = "malformed_json"
 	TokenBlacklisted string = "token_blacklisted"
+	TokenInvalid     string = "token_invalid"
+	ValidationFailed string = "validation_failed"
+	UntilBeforeTo    string = "until_before_to"
 	InternalError    string = "internal_error"
 	NotFound         string = "not_found"
 	Created          string = "created"