diff --git a/app/app.go b/app/app.go
index 9cbfc52..ae7f0ff 100644
--- a/app/app.go
+++ b/app/app.go
@@ -47,8 +47,9 @@ const (
 	InvalidEntityID   string = "invalid_entity_id"
 	NotImplemented    string = "not_implemented"
 	NotPassValidation string = "not_pass_validation"
+	NotEnoughBalance  string = "not_enough_balance"
 
-	// User keys
+	// User keys (DB)
 	UserUsernameKey       string = "username_key"
 	UserEmailKey          string = "email_key"
 	UsernameAlreadyExists string = "username_already_exists"
@@ -56,9 +57,12 @@ const (
 	EmailAlreadyExists    string = "email_already_exists"
 	PhoneNumberKey        string = "phone_number_key"
 	PhoneAlreadyExists    string = "phone_already_exists"
-	IncorrectPassword     string = "incorrect_password"
-	ErrorGeneratingToken  string = "error_generating_token"
-	LoggedIn              string = "logged_in"
+
+	// Auth
+	TokenPayload         string = "token_payload"
+	LoggedIn             string = "logged_in"
+	IncorrectPassword    string = "incorrect_password"
+	ErrorGeneratingToken string = "error_generating_token"
 )
 
 var (
diff --git a/db/pgx.go b/db/pgx.go
index f10ad5d..e1a466e 100644
--- a/db/pgx.go
+++ b/db/pgx.go
@@ -2,11 +2,12 @@ package db
 
 import (
 	"context"
+	"log/slog"
+
 	_ "github.com/jackc/pgconn"
 	_ "github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
 	_ "github.com/jackc/pgx/v5/stdlib"
-	"log/slog"
 )
 
 func NewPGXPool(dataSource string) *pgxpool.Pool {