diff --git a/invenio_checks/ext.py b/invenio_checks/ext.py
index 7283d3e..b3d23fa 100644
--- a/invenio_checks/ext.py
+++ b/invenio_checks/ext.py
@@ -26,29 +26,15 @@ def __init__(self, app=None):
     def init_app(self, app):
         """Flask application initialization."""
         self.init_config(app)
-        self.init_services(app)
         app.extensions["invenio-checks"] = self
         self.checks_registry = ChecksRegistry()
         self.checks_registry.load_from_entry_points(app, "invenio_checks.check_types")
+        self.service = CheckConfigService(
+            config=ChecksConfigServiceConfig.build(app),
+        )
 
     def init_config(self, app):
         """Initialize configuration."""
         for k in dir(config):
             if k.startswith("CHECKS_"):
                 app.config.setdefault(k, getattr(config, k))
-
-    def service_configs(self, app):
-        """Customized service configs."""
-
-        class ServiceConfigs:
-            checks_configs = ChecksConfigServiceConfig.build(app)
-
-        return ServiceConfigs
-
-    def init_services(self, app):
-        """Initialize the service and resource for Requests."""
-        service_configs = self.service_configs(app)
-
-        self.checks_configs_service = CheckConfigService(
-            config=service_configs.checks_configs,
-        )
diff --git a/invenio_checks/proxies.py b/invenio_checks/proxies.py
index f8a804d..96ae951 100644
--- a/invenio_checks/proxies.py
+++ b/invenio_checks/proxies.py
@@ -14,6 +14,6 @@
 )
 
 current_checks_configs_service = LocalProxy(
-    lambda: current_app.extensions["invenio-checks"].checks_configs_service
+    lambda: current_app.extensions["invenio-checks"].service
 )
 """Proxy to the instantiated checks_configs service."""
diff --git a/invenio_checks/services/schema.py b/invenio_checks/services/schema.py
index ac8707b..e051800 100644
--- a/invenio_checks/services/schema.py
+++ b/invenio_checks/services/schema.py
@@ -8,12 +8,15 @@
 """Service schemas."""
 
 from datetime import timezone
+from uuid import UUID
 
-from marshmallow import EXCLUDE, Schema, fields
+from marshmallow import EXCLUDE, Schema, ValidationError, fields, validates
 from marshmallow_utils.fields import SanitizedUnicode, TZDateTime
 from marshmallow_utils.permissions import FieldPermissionsMixin
+from sqlalchemy.orm import validates
 
-from ..models import CheckRunStatus
+from ..models import CheckRunStatus, Severity
+from ..proxies import current_checks_registry
 
 
 class CheckConfigSchema(Schema, FieldPermissionsMixin):
@@ -25,14 +28,31 @@ class Meta:
         unknown = EXCLUDE
 
     id = fields.UUID(dump_only=True)
-
-    created = TZDateTime(timezone=timezone.utc, format="iso", dump_only=True)
-    updated = TZDateTime(timezone=timezone.utc, format="iso", dump_only=True)
-
-    title = SanitizedUnicode(required=True)
-    description = SanitizedUnicode()
-
-    active = fields.Boolean(load_default=True)
+    community_id = fields.Str(required=True)
+    check_id = fields.Str(required=True)
+    params = fields.Dict(required=False, default={})
+    severity = fields.Str(required=False, default=Severity.INFO.value)
+    enabled = fields.Bool(required=False, default=True)
+
+    @validates("community_id")
+    def validate_community_id(self, value):
+        """Validate that the community_id is a valid UUID."""
+        try:
+            UUID(value)
+        except ValueError:
+            raise ValidationError("Invalid UUID format for community_id.")
+
+    @validates("check_id")
+    def validate_check_id(self, value):
+        """Validate that the check_id exists in the registry."""
+        if not current_checks_registry.get(value):
+            raise ValidationError(f"Check with id '{value}' not found.")
+
+    @validates("severity")
+    def validate_severity(self, value):
+        """Validate that the severity is a valid enum value."""
+        if value not in [s.value for s in Severity]:
+            raise ValidationError(f"Invalid severity value: {value}.")
 
 
 class CheckRunSchema(Schema, FieldPermissionsMixin):
diff --git a/invenio_checks/services/services.py b/invenio_checks/services/services.py
index d54489b..02f632c 100644
--- a/invenio_checks/services/services.py
+++ b/invenio_checks/services/services.py
@@ -15,9 +15,11 @@
     ModelDeleteOp,
     unit_of_work,
 )
-from sqlalchemy.orm.exc import MultipleResultsFound, NoResultFound
+from marshmallow import ValidationError
+from sqlalchemy.orm.exc import NoResultFound
 
-from ..models import CheckConfig
+from ..models import CheckConfig, Severity
+from .schema import CheckConfigSchema
 
 
 class BaseClass(RecordService):
@@ -49,13 +51,19 @@ def create(self, identity, data, uow=None, **kwargs):
         """Create a check configuration."""
         self.require_permission(identity, "create")
 
+        schema = CheckConfigSchema()
+        try:
+            validated_data = schema.load(data)
+        except ValidationError as e:
+            raise ValueError(f"Validation error: {e.messages}")
+
         try:
             check_config = CheckConfig(
-                community_id=UUID(data["community_id"]),
-                check_id=data["check_id"],
-                params=data.get("params", {}),
-                severity=data.get("severity", "I"),
-                enabled=data.get("enabled", True),
+                community_id=UUID(validated_data["community_id"]),
+                check_id=validated_data["check_id"],
+                params=validated_data.get("params", {}),
+                severity=validated_data.get("severity", Severity.INFO.value),
+                enabled=validated_data.get("enabled", True),
             )
             uow.register(ModelCommitOp(check_config))
             return check_config