diff --git a/service/maintenance_fee.go b/service/maintenance_fee.go
index 2fa076d..b6eaf54 100644
--- a/service/maintenance_fee.go
+++ b/service/maintenance_fee.go
@@ -4,17 +4,23 @@ import (
 	"electricity_bill_calc/cache"
 	"electricity_bill_calc/exceptions"
 	"electricity_bill_calc/global"
+	"electricity_bill_calc/logger"
 	"electricity_bill_calc/model"
 	"fmt"
 
 	"github.com/google/uuid"
 	"github.com/samber/lo"
 	"github.com/uptrace/bun"
+	"go.uber.org/zap"
 )
 
-type _MaintenanceFeeService struct{}
+type _MaintenanceFeeService struct {
+	l *zap.Logger
+}
 
-var MaintenanceFeeService _MaintenanceFeeService
+var MaintenanceFeeService = _MaintenanceFeeService{
+	l: logger.Named("Service", "maintenance"),
+}
 
 func (_MaintenanceFeeService) ListMaintenanceFees(pid []string) ([]model.MaintenanceFee, error) {
 	if fees, _ := cache.RetreiveSearch[[]model.MaintenanceFee]("maintenance_fee", pid...); fees != nil {