diff --git a/backend/notifications/api/views.py b/backend/notifications/api/views.py
index 31d4fff7..304cc666 100644
--- a/backend/notifications/api/views.py
+++ b/backend/notifications/api/views.py
@@ -590,6 +590,13 @@ def subscribe_push(request):
         }
     )
 
+    prefs, _ = UserChannelPreferences.objects.get_or_create(
+        user=request.user,
+    )
+    if not prefs.push_enabled:
+        prefs.push_enabled = True
+        prefs.save(update_fields=["push_enabled"])
+
     return Response({
         'status': 'success',
         'message': (
@@ -628,6 +635,18 @@ def unsubscribe_push(request):
             user=request.user
         ).delete()
 
+    has_active_devices = WebPushDevice.objects.filter(
+        user=request.user,
+        active=True,
+    ).exists()
+    if not has_active_devices:
+        prefs, _ = UserChannelPreferences.objects.get_or_create(
+            user=request.user,
+        )
+        if prefs.push_enabled:
+            prefs.push_enabled = False
+            prefs.save(update_fields=["push_enabled"])
+
     return Response({
         'status': 'success',
         'message': f'Deleted {deleted_count} push subscription(s)',
diff --git a/backend/tests/api/v1/notifications/test_notifications_api.py b/backend/tests/api/v1/notifications/test_notifications_api.py
index 0d0f4e59..f34e0db3 100644
--- a/backend/tests/api/v1/notifications/test_notifications_api.py
+++ b/backend/tests/api/v1/notifications/test_notifications_api.py
@@ -2,6 +2,7 @@ from unittest.mock import patch
 
 import pytest
 
+from push_notifications.models import WebPushDevice
 from notifications.models import Notification
 from notifications.models import UserChannelPreferences
 
@@ -158,3 +159,54 @@ class TestNotificationPreferencesApi:
         assert response.status_code == 200
         prefs = UserChannelPreferences.objects.get(user=user)
         assert prefs.email_frequency == "never"
+
+    def test_subscribe_push_enables_push_preferences(
+        self, api_client, user_factory
+    ):
+        user = user_factory()
+        UserChannelPreferences.objects.create(user=user, push_enabled=False)
+        api_client.force_authenticate(user=user)
+
+        response = api_client.post(
+            "/api/v1/notifications/push/subscribe/",
+            {
+                "endpoint": "https://push.example.test/endpoint-1",
+                "keys": {"p256dh": "test-p256dh", "auth": "test-auth"},
+                "device_name": "Chrome",
+            },
+            format="json",
+        )
+
+        assert response.status_code == 200
+        prefs = UserChannelPreferences.objects.get(user=user)
+        assert prefs.push_enabled is True
+        assert WebPushDevice.objects.filter(
+            user=user,
+            registration_id="https://push.example.test/endpoint-1",
+            active=True,
+        ).exists()
+
+    def test_unsubscribe_last_push_device_disables_push_preferences(
+        self, api_client, user_factory
+    ):
+        user = user_factory()
+        UserChannelPreferences.objects.create(user=user, push_enabled=True)
+        WebPushDevice.objects.create(
+            user=user,
+            registration_id="https://push.example.test/endpoint-1",
+            p256dh="test-p256dh",
+            auth="test-auth",
+            browser="Chrome",
+            active=True,
+        )
+        api_client.force_authenticate(user=user)
+
+        response = api_client.delete(
+            "/api/v1/notifications/push/unsubscribe/",
+            {"endpoint": "https://push.example.test/endpoint-1"},
+            format="json",
+        )
+
+        assert response.status_code == 200
+        prefs = UserChannelPreferences.objects.get(user=user)
+        assert prefs.push_enabled is False
diff --git a/backend/tests/api/v1/procurement/test_procurement_requests.py b/backend/tests/api/v1/procurement/test_procurement_requests.py
index 722ebb36..93ff9e10 100644
--- a/backend/tests/api/v1/procurement/test_procurement_requests.py
+++ b/backend/tests/api/v1/procurement/test_procurement_requests.py
@@ -3,11 +3,13 @@
 """
 
 from decimal import Decimal
+from unittest.mock import patch
 
 import pytest
 from django.contrib.auth.models import Permission
 from django.urls import reverse
 from django.utils import timezone
+from push_notifications.models import WebPushDevice
 from rest_framework import status
 from rest_framework.test import APIClient
 
@@ -33,6 +35,7 @@ from procurement.models import (
     ProcurementItem,
     ProcurementRequest,
 )
+from notifications.models import Notification, UserChannelPreferences
 
 
 pytestmark = pytest.mark.django_db
@@ -1637,6 +1640,63 @@ class TestProcessingDepartmentWorkflow:
             "ordered_quantity",
         ]
 
+    @pytest.mark.django_db(transaction=True)
+    def test_item_order_update_routes_push_to_requestor(
+        self, api_client, supply_user, processing_request,
+        procurement_item_factory
+    ):
+        item = procurement_item_factory(
+            request=processing_request,
+            quantity=3,
+        )
+        processing_request.executor = supply_user
+        processing_request.status = ProcurementStatus.IN_PROGRESS
+        processing_request.save()
+        UserChannelPreferences.objects.update_or_create(
+            user=processing_request.requestor,
+            defaults={
+                "web_enabled": False,
+                "email_enabled": False,
+                "push_enabled": True,
+                "disabled_verbs": [],
+            },
+        )
+        WebPushDevice.objects.create(
+            user=processing_request.requestor,
+            registration_id="https://push.example.test/procurement-item",
+            p256dh="test-p256dh",
+            auth="test-auth",
+            browser="Chrome",
+            active=True,
+        )
+
+        api_client.force_authenticate(user=supply_user)
+        item_url = reverse(
+            'api:v1:procurement:procurementitem-detail',
+            kwargs={'pk': item.id},
+        )
+
+        with patch(
+            "notifications.tasks.send_push_notification.delay"
+        ) as send_push:
+            response = api_client.patch(
+                item_url,
+                {"ordered_quantity": 2},
+                format="json",
+            )
+
+        assert response.status_code == status.HTTP_200_OK
+        notification = Notification.objects.get(
+            recipient=processing_request.requestor,
+            verb="procurement_item_updated",
+            data__item_id=item.id,
+        )
+        assert notification.data["changed_fields"] == [
+            "ordered_quantity",
+            "execution_status",
+        ]
+        send_push.assert_called_once_with(notification.id)
+
     def test_item_expected_delivery_dates_must_be_valid_dates(
         self, api_client, supply_user, processing_request,
         procurement_item_factory