fix missing import

services/admin.py

@@ -24,6 +24,7 @@ from datetime import timedelta
 
 from djadhere.utils import get_active_filter
 from adhesions.models import Adhesion
+from banking.models import PaymentUpdate
 from .models import Service, ServiceType, IPPrefix, IPResource, Route, Tunnel, ServiceAllocation, Antenna, AntennaAllocation, Allocation
 from .utils import notify_allocation
 from .forms import AntennaForm