diff --git a/InvenTree/InvenTree/api.py b/InvenTree/InvenTree/api.py
index 0183c12c20..c5f6c110ae 100644
--- a/InvenTree/InvenTree/api.py
+++ b/InvenTree/InvenTree/api.py
@@ -91,7 +91,7 @@ class VersionView(APIView):
         })
 
 
-class VersionSerializer(serializers.Serializer):
+class VersionInformationSerializer(serializers.Serializer):
     """Serializer for a single version."""
 
     version = serializers.CharField()
@@ -101,21 +101,21 @@ class VersionSerializer(serializers.Serializer):
     latest = serializers.BooleanField()
 
     class Meta:
-        """Meta class for VersionSerializer."""
+        """Meta class for VersionInformationSerializer."""
 
-        fields = ['version', 'date', 'gh', 'text', 'latest']
+        fields = '__all__'
 
 
 class VersionApiSerializer(serializers.Serializer):
     """Serializer for the version api endpoint."""
 
-    VersionSerializer(many=True)
+    VersionInformationSerializer(many=True)
 
 
 class VersionTextView(ListAPI):
     """Simple JSON endpoint for InvenTree version text."""
 
-    serializer_class = VersionSerializer
+    serializer_class = VersionInformationSerializer
 
     permission_classes = [permissions.IsAdminUser]
 
diff --git a/InvenTree/InvenTree/api_version.py b/InvenTree/InvenTree/api_version.py
index bc69e28ae8..8d2c02ccfe 100644
--- a/InvenTree/InvenTree/api_version.py
+++ b/InvenTree/InvenTree/api_version.py
@@ -1,11 +1,15 @@
 """InvenTree API version information."""
 
 # InvenTree API version
-INVENTREE_API_VERSION = 184
+INVENTREE_API_VERSION = 185
 """Increment this API version number whenever there is a significant change to the API that any clients need to know about."""
 
 INVENTREE_API_TEXT = """
 
+v185 - 2024-03-24 : https://github.com/inventree/InvenTree/pull/6836
+    - Remove /plugin/activate endpoint
+    - Update docstrings and typing for various API endpoints (no functional changes)
+
 v184 - 2024-03-17 : https://github.com/inventree/InvenTree/pull/10464
     - Add additional fields for tests (start/end datetime, test station)
 
diff --git a/InvenTree/common/serializers.py b/InvenTree/common/serializers.py
index c9508dd2d9..360794d8a5 100644
--- a/InvenTree/common/serializers.py
+++ b/InvenTree/common/serializers.py
@@ -63,7 +63,7 @@ class SettingsSerializer(InvenTreeModelSerializer):
 
     typ = serializers.CharField(read_only=True)
 
-    def get_choices(self, obj):
+    def get_choices(self, obj) -> list:
         """Returns the choices available for a given item."""
         results = []
 
diff --git a/InvenTree/company/api.py b/InvenTree/company/api.py
index 246fc75fe8..8a0b839064 100644
--- a/InvenTree/company/api.py
+++ b/InvenTree/company/api.py
@@ -82,7 +82,7 @@ class CompanyDetail(RetrieveUpdateDestroyAPI):
 
 
 class CompanyAttachmentList(AttachmentMixin, ListCreateDestroyAPIView):
-    """API endpoint for the CompanyAttachment model."""
+    """API endpoint for listing, creating and bulk deleting a CompanyAttachment."""
 
     queryset = CompanyAttachment.objects.all()
     serializer_class = CompanyAttachmentSerializer
@@ -215,7 +215,7 @@ class ManufacturerPartDetail(RetrieveUpdateDestroyAPI):
 
 
 class ManufacturerPartAttachmentList(AttachmentMixin, ListCreateDestroyAPIView):
-    """API endpoint for listing (and creating) a ManufacturerPartAttachment (file upload)."""
+    """API endpoint for listing, creating and bulk deleting a ManufacturerPartAttachment (file upload)."""
 
     queryset = ManufacturerPartAttachment.objects.all()
     serializer_class = ManufacturerPartAttachmentSerializer
diff --git a/InvenTree/order/api.py b/InvenTree/order/api.py
index eee46120f0..8d9735fa4f 100644
--- a/InvenTree/order/api.py
+++ b/InvenTree/order/api.py
@@ -629,7 +629,7 @@ class PurchaseOrderExtraLineDetail(RetrieveUpdateDestroyAPI):
 
 
 class SalesOrderAttachmentList(AttachmentMixin, ListCreateDestroyAPIView):
-    """API endpoint for listing (and creating) a SalesOrderAttachment (file upload)."""
+    """API endpoint for listing, creating and bulk deleting a SalesOrderAttachment (file upload)."""
 
     queryset = models.SalesOrderAttachment.objects.all()
     serializer_class = serializers.SalesOrderAttachmentSerializer
@@ -1097,7 +1097,7 @@ class SalesOrderShipmentComplete(CreateAPI):
 
 
 class PurchaseOrderAttachmentList(AttachmentMixin, ListCreateDestroyAPIView):
-    """API endpoint for listing (and creating) a PurchaseOrderAttachment (file upload)."""
+    """API endpoint for listing, creating and bulk deleting) a PurchaseOrderAttachment (file upload)."""
 
     queryset = models.PurchaseOrderAttachment.objects.all()
     serializer_class = serializers.PurchaseOrderAttachmentSerializer
@@ -1363,7 +1363,7 @@ class ReturnOrderExtraLineDetail(RetrieveUpdateDestroyAPI):
 
 
 class ReturnOrderAttachmentList(AttachmentMixin, ListCreateDestroyAPIView):
-    """API endpoint for listing (and creating) a ReturnOrderAttachment (file upload)."""
+    """API endpoint for listing, creating and bulk deleting a ReturnOrderAttachment (file upload)."""
 
     queryset = models.ReturnOrderAttachment.objects.all()
     serializer_class = serializers.ReturnOrderAttachmentSerializer
diff --git a/InvenTree/part/api.py b/InvenTree/part/api.py
index 7b7ec1c7e5..fb46913cf1 100644
--- a/InvenTree/part/api.py
+++ b/InvenTree/part/api.py
@@ -10,6 +10,8 @@ from django.utils.translation import gettext_lazy as _
 
 from django_filters import rest_framework as rest_filters
 from django_filters.rest_framework import DjangoFilterBackend
+from drf_spectacular.types import OpenApiTypes
+from drf_spectacular.utils import extend_schema_field
 from rest_framework import permissions, serializers, status
 from rest_framework.exceptions import ValidationError
 from rest_framework.response import Response
@@ -214,6 +216,7 @@ class CategoryFilter(rest_filters.FilterSet):
         help_text=_('Exclude sub-categories under the specified category'),
     )
 
+    @extend_schema_field(OpenApiTypes.INT)
     def filter_exclude_tree(self, queryset, name, value):
         """Exclude all sub-categories under the specified category."""
         # Exclude the specified category
@@ -406,7 +409,7 @@ class PartInternalPriceList(ListCreateAPI):
 
 
 class PartAttachmentList(AttachmentMixin, ListCreateDestroyAPIView):
-    """API endpoint for listing (and creating) a PartAttachment (file upload)."""
+    """API endpoint for listing, creating and bulk deleting a PartAttachment (file upload)."""
 
     queryset = PartAttachment.objects.all()
     serializer_class = part_serializers.PartAttachmentSerializer
@@ -1003,6 +1006,7 @@ class PartFilter(rest_filters.FilterSet):
         method='filter_convert_from',
     )
 
+    @extend_schema_field(OpenApiTypes.INT)
     def filter_convert_from(self, queryset, name, part):
         """Limit the queryset to valid conversion options for the specified part."""
         conversion_options = part.get_conversion_options()
@@ -1017,6 +1021,7 @@ class PartFilter(rest_filters.FilterSet):
         method='filter_exclude_tree',
     )
 
+    @extend_schema_field(OpenApiTypes.INT)
     def filter_exclude_tree(self, queryset, name, part):
         """Exclude all parts and variants 'down' from the specified part from the queryset."""
         children = part.get_descendants(include_self=True)
@@ -1027,6 +1032,7 @@ class PartFilter(rest_filters.FilterSet):
         label='Ancestor', queryset=Part.objects.all(), method='filter_ancestor'
     )
 
+    @extend_schema_field(OpenApiTypes.INT)
     def filter_ancestor(self, queryset, name, part):
         """Limit queryset to descendants of the specified ancestor part."""
         descendants = part.get_descendants(include_self=False)
@@ -1044,6 +1050,7 @@ class PartFilter(rest_filters.FilterSet):
         label='In BOM Of', queryset=Part.objects.all(), method='filter_in_bom'
     )
 
+    @extend_schema_field(OpenApiTypes.INT)
     def filter_in_bom(self, queryset, name, part):
         """Limit queryset to parts in the BOM for the specified part."""
         bom_parts = part.get_parts_in_bom()
@@ -1528,6 +1535,7 @@ class PartParameterTemplateFilter(rest_filters.FilterSet):
         queryset=Part.objects.all(), method='filter_part', label=_('Part')
     )
 
+    @extend_schema_field(OpenApiTypes.INT)
     def filter_part(self, queryset, name, part):
         """Filter queryset to include only PartParameterTemplates which are referenced by a part."""
         parameters = PartParameter.objects.filter(part=part)
@@ -1541,6 +1549,7 @@ class PartParameterTemplateFilter(rest_filters.FilterSet):
         label=_('Category'),
     )
 
+    @extend_schema_field(OpenApiTypes.INT)
     def filter_category(self, queryset, name, category):
         """Filter queryset to include only PartParameterTemplates which are referenced by parts in this category."""
         cats = category.get_descendants(include_self=True)
@@ -1828,6 +1837,7 @@ class BomFilter(rest_filters.FilterSet):
         queryset=Part.objects.all(), method='filter_uses', label=_('Uses')
     )
 
+    @extend_schema_field(OpenApiTypes.INT)
     def filter_uses(self, queryset, name, part):
         """Filter the queryset based on the specified part."""
         return queryset.filter(part.get_used_in_bom_item_filter())
diff --git a/InvenTree/plugin/api.py b/InvenTree/plugin/api.py
index be16328c0a..f14ab7e719 100644
--- a/InvenTree/plugin/api.py
+++ b/InvenTree/plugin/api.py
@@ -466,7 +466,6 @@ plugin_api_urls = [
             # Plugin management
             path('reload/', PluginReload.as_view(), name='api-plugin-reload'),
             path('install/', PluginInstall.as_view(), name='api-plugin-install'),
-            path('activate/', PluginActivate.as_view(), name='api-plugin-activate'),
             # Registry status
             path(
                 'status/',
diff --git a/InvenTree/plugin/test_api.py b/InvenTree/plugin/test_api.py
index a0474c551d..b66282f21b 100644
--- a/InvenTree/plugin/test_api.py
+++ b/InvenTree/plugin/test_api.py
@@ -90,12 +90,19 @@ class PluginDetailAPITest(PluginMixin, InvenTreeAPITestCase):
     def test_plugin_activate(self):
         """Test the plugin activate."""
         test_plg = self.plugin_confs.first()
+        assert test_plg is not None
 
         def assert_plugin_active(self, active):
-            self.assertEqual(PluginConfig.objects.all().first().active, active)
+            plgs = PluginConfig.objects.all().first()
+            assert plgs is not None
+            self.assertEqual(plgs.active, active)
 
         # Should not work - not a superuser
-        response = self.client.post(reverse('api-plugin-activate'), {}, follow=True)
+        response = self.client.post(
+            reverse('api-plugin-detail-activate', kwargs={'pk': test_plg.pk}),
+            {},
+            follow=True,
+        )
         self.assertEqual(response.status_code, 403)
 
         # Make user superuser
@@ -109,7 +116,7 @@ class PluginDetailAPITest(PluginMixin, InvenTreeAPITestCase):
         # Activate plugin with detail url
         assert_plugin_active(self, False)
         response = self.client.patch(
-            reverse('api-plugin-detail-activate', kwargs={'pk': test_plg.id}),
+            reverse('api-plugin-detail-activate', kwargs={'pk': test_plg.pk}),
             {},
             follow=True,
         )
@@ -123,7 +130,9 @@ class PluginDetailAPITest(PluginMixin, InvenTreeAPITestCase):
         # Activate plugin
         assert_plugin_active(self, False)
         response = self.client.patch(
-            reverse('api-plugin-activate'), {'pk': test_plg.pk}, follow=True
+            reverse('api-plugin-detail-activate', kwargs={'pk': test_plg.pk}),
+            {},
+            follow=True,
         )
         self.assertEqual(response.status_code, 200)
         assert_plugin_active(self, True)
@@ -133,6 +142,8 @@ class PluginDetailAPITest(PluginMixin, InvenTreeAPITestCase):
         url = reverse('admin:plugin_pluginconfig_changelist')
 
         test_plg = self.plugin_confs.first()
+        assert test_plg is not None
+
         # deactivate plugin
         response = self.client.post(
             url,
@@ -181,6 +192,8 @@ class PluginDetailAPITest(PluginMixin, InvenTreeAPITestCase):
         """Test the PluginConfig model."""
         # check mixin registry
         plg = self.plugin_confs.first()
+        assert plg is not None
+
         mixin_dict = plg.mixins()
         self.assertIn('base', mixin_dict)
         self.assertDictContainsSubset(
@@ -190,6 +203,8 @@ class PluginDetailAPITest(PluginMixin, InvenTreeAPITestCase):
         # check reload on save
         with self.assertWarns(Warning) as cm:
             plg_inactive = self.plugin_confs.filter(active=False).first()
+            assert plg_inactive is not None
+
             plg_inactive.active = True
             plg_inactive.save()
         self.assertEqual(cm.warning.args[0], 'A reload was triggered')
@@ -208,7 +223,7 @@ class PluginDetailAPITest(PluginMixin, InvenTreeAPITestCase):
 
         # Wrong with pk
         with self.assertRaises(NotFound) as exc:
-            check_plugin(plugin_slug=None, plugin_pk='123')
+            check_plugin(plugin_slug=None, plugin_pk=123)
         self.assertEqual(str(exc.exception.detail), "Plugin '123' not installed")
 
     def test_plugin_settings(self):
@@ -219,6 +234,8 @@ class PluginDetailAPITest(PluginMixin, InvenTreeAPITestCase):
 
         # Activate the 'sample' plugin via the API
         cfg = PluginConfig.objects.filter(key='sample').first()
+        assert cfg is not None
+
         url = reverse('api-plugin-detail-activate', kwargs={'pk': cfg.pk})
         self.client.patch(url, {}, expected_code=200)
 
diff --git a/InvenTree/stock/api.py b/InvenTree/stock/api.py
index bd5d59fc4e..80ca2efede 100644
--- a/InvenTree/stock/api.py
+++ b/InvenTree/stock/api.py
@@ -11,6 +11,8 @@ from django.urls import include, path
 from django.utils.translation import gettext_lazy as _
 
 from django_filters import rest_framework as rest_filters
+from drf_spectacular.types import OpenApiTypes
+from drf_spectacular.utils import extend_schema_field
 from rest_framework import status
 from rest_framework.response import Response
 from rest_framework.serializers import ValidationError
@@ -480,9 +482,17 @@ class StockFilter(rest_filters.FilterSet):
     # Relationship filters
     manufacturer = rest_filters.ModelChoiceFilter(
         label='Manufacturer',
-        queryset=Company.objects.filter(is_manufacturer=True),
-        field_name='manufacturer_part__manufacturer',
+        queryset=Company.objects.all(),
+        method='filter_manufacturer',
     )
+
+    @extend_schema_field(OpenApiTypes.INT)
+    def filter_manufacturer(self, queryset, name, company):
+        """Filter by manufacturer."""
+        return queryset.filter(
+            Q(is_manufacturer=True) & Q(manufacturer_part__manufacturer=company)
+        )
+
     supplier = rest_filters.ModelChoiceFilter(
         label='Supplier',
         queryset=Company.objects.filter(is_supplier=True),
@@ -725,6 +735,7 @@ class StockFilter(rest_filters.FilterSet):
         label='Ancestor', queryset=StockItem.objects.all(), method='filter_ancestor'
     )
 
+    @extend_schema_field(OpenApiTypes.INT)
     def filter_ancestor(self, queryset, name, ancestor):
         """Filter based on ancestor stock item."""
         return queryset.filter(parent__in=ancestor.get_descendants(include_self=True))
@@ -735,6 +746,7 @@ class StockFilter(rest_filters.FilterSet):
         method='filter_category',
     )
 
+    @extend_schema_field(OpenApiTypes.INT)
     def filter_category(self, queryset, name, category):
         """Filter based on part category."""
         child_categories = category.get_descendants(include_self=True)
@@ -745,6 +757,7 @@ class StockFilter(rest_filters.FilterSet):
         label=_('BOM Item'), queryset=BomItem.objects.all(), method='filter_bom_item'
     )
 
+    @extend_schema_field(OpenApiTypes.INT)
     def filter_bom_item(self, queryset, name, bom_item):
         """Filter based on BOM item."""
         return queryset.filter(bom_item.get_stock_filter())
@@ -753,6 +766,7 @@ class StockFilter(rest_filters.FilterSet):
         label=_('Part Tree'), queryset=Part.objects.all(), method='filter_part_tree'
     )
 
+    @extend_schema_field(OpenApiTypes.INT)
     def filter_part_tree(self, queryset, name, part_tree):
         """Filter based on part tree."""
         return queryset.filter(part__tree_id=part_tree.tree_id)
@@ -761,6 +775,7 @@ class StockFilter(rest_filters.FilterSet):
         label=_('Company'), queryset=Company.objects.all(), method='filter_company'
     )
 
+    @extend_schema_field(OpenApiTypes.INT)
     def filter_company(self, queryset, name, company):
         """Filter by company (either manufacturer or supplier)."""
         return queryset.filter(
@@ -813,6 +828,7 @@ class StockList(APIDownloadMixin, ListCreateDestroyAPIView):
 
     - GET: Return a list of all StockItem objects (with optional query filters)
     - POST: Create a new StockItem
+    - DELETE: Delete multiple StockItem objects
     """
 
     serializer_class = StockSerializers.StockItemSerializer
@@ -1199,7 +1215,7 @@ class StockList(APIDownloadMixin, ListCreateDestroyAPIView):
 
 
 class StockAttachmentList(AttachmentMixin, ListCreateDestroyAPIView):
-    """API endpoint for listing (and creating) a StockItemAttachment (file upload)."""
+    """API endpoint for listing, creating and bulk deleting a StockItemAttachment (file upload)."""
 
     queryset = StockItemAttachment.objects.all()
     serializer_class = StockSerializers.StockItemAttachmentSerializer
diff --git a/InvenTree/web/urls.py b/InvenTree/web/urls.py
index 56043c8ed9..17ac2abea3 100644
--- a/InvenTree/web/urls.py
+++ b/InvenTree/web/urls.py
@@ -29,11 +29,11 @@ class PreferredSerializer(serializers.Serializer):
     pui = serializers.SerializerMethodField(read_only=True)
     cui = serializers.SerializerMethodField(read_only=True)
 
-    def get_pui(self, obj):
+    def get_pui(self, obj) -> bool:
         """Return true if preferred method is PUI."""
         return obj['preferred_method'] == 'pui'
 
-    def get_cui(self, obj):
+    def get_cui(self, obj) -> bool:
         """Return true if preferred method is CUI."""
         return obj['preferred_method'] == 'cui'