diff --git a/installers/charm/osm-nglcm/src/charm.py b/installers/charm/osm-nglcm/src/charm.py
index feec54f..4169894 100755
--- a/installers/charm/osm-nglcm/src/charm.py
+++ b/installers/charm/osm-nglcm/src/charm.py
@@ -30,6 +30,7 @@
 import logging
 from typing import Any, Dict
 
+from charms.data_platform_libs.v0.data_interfaces import DatabaseRequires
 from charms.osm_libs.v0.utils import (
     CharmError,
     DebugMode,
@@ -44,8 +45,6 @@
 from ops.main import main
 from ops.model import ActiveStatus, Container
 
-from legacy_interfaces import MongoClient
-
 HOSTPATHS = [
     HostPath(
         config="lcm-hostpath",
@@ -82,7 +81,9 @@
         super().__init__(*args)
         self.vca = VcaRequires(self)
         self.temporal = TemporalRequires(self)
-        self.mongodb_client = MongoClient(self, "mongodb")
+        self.mongodb_client = DatabaseRequires(
+            self, "mongodb", database_name="osm", extra_user_roles="admin"
+        )
         self._observe_charm_events()
         self.container: Container = self.unit.get_container(self.container_name)
         self.debug_mode = DebugMode(self, self._stored, self.container, HOSTPATHS)
@@ -171,7 +172,7 @@
             self.on.config_changed: self._on_config_changed,
             self.on.update_status: self._on_update_status,
             # Relation events
-            self.on["mongodb"].relation_changed: self._on_config_changed,
+            self.mongodb_client.on.database_created: self._on_config_changed,
             self.on["mongodb"].relation_broken: self._on_required_relation_broken,
             self.on["temporal"].relation_changed: self._on_config_changed,
             self.on["temporal"].relation_broken: self._on_required_relation_broken,
@@ -192,7 +193,7 @@
         logger.debug("check for missing relations")
         missing_relations = []
 
-        if self.mongodb_client.is_missing_data_in_unit():
+        if not self._is_database_available():
             missing_relations.append("mongodb")
         if not self.temporal.host or not self.temporal.port:
             missing_relations.append("temporal")
@@ -204,6 +205,12 @@
             logger.warning(error_msg)
             raise CharmError(error_msg)
 
+    def _is_database_available(self) -> bool:
+        try:
+            return self.mongodb_client.is_resource_created()
+        except KeyError:
+            return False
+
     def _configure_service(self, container: Container) -> None:
         """Add Pebble layer with the lcm service."""
         logger.debug(f"configuring {self.app.name} service")
@@ -217,13 +224,13 @@
             "OSMLCM_GLOBAL_LOGLEVEL": self.config["log-level"].upper(),
             # Database configuration
             "OSMLCM_DATABASE_DRIVER": "mongo",
-            "OSMLCM_DATABASE_URI": self.mongodb_client.connection_string,
+            "OSMLCM_DATABASE_URI": self._get_mongodb_uri(),
             "OSMLCM_DATABASE_COMMONKEY": self.config["database-commonkey"],
             # Storage configuration
             "OSMLCM_STORAGE_DRIVER": "mongo",
             "OSMLCM_STORAGE_PATH": "/app/storage",
             "OSMLCM_STORAGE_COLLECTION": "files",
-            "OSMLCM_STORAGE_URI": self.mongodb_client.connection_string,
+            "OSMLCM_STORAGE_URI": self._get_mongodb_uri(),
             "OSMLCM_VCA_HELM_CA_CERTS": self.config["helm-ca-certs"],
             "OSMLCM_VCA_STABLEREPOURL": self.config["helm-stable-repo-url"],
             # Temporal configuration
@@ -264,6 +271,9 @@
         logger.info(f"Layer: {layer_config}")
         return layer_config
 
+    def _get_mongodb_uri(self):
+        return list(self.mongodb_client.fetch_relation_data().values())[0]["uris"]
+
 
 if __name__ == "__main__":  # pragma: no cover
     main(OsmNGLcmCharm)
diff --git a/installers/charm/osm-nglcm/src/legacy_interfaces.py b/installers/charm/osm-nglcm/src/legacy_interfaces.py
deleted file mode 100644
index d56f31d..0000000
--- a/installers/charm/osm-nglcm/src/legacy_interfaces.py
+++ /dev/null
@@ -1,107 +0,0 @@
-#!/usr/bin/env python3
-# Copyright 2022 Canonical Ltd.
-#
-# Licensed under the Apache License, Version 2.0 (the "License"); you may
-# not use this file except in compliance with the License. You may obtain
-# a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations
-# under the License.
-#
-# For those usages not covered by the Apache License, Version 2.0 please
-# contact: legal@canonical.com
-#
-# To get in touch with the maintainers, please contact:
-# osm-charmers@lists.launchpad.net
-#
-# flake8: noqa
-
-import ops
-
-
-class BaseRelationClient(ops.framework.Object):
-    """Requires side of a Kafka Endpoint"""
-
-    def __init__(
-        self, charm: ops.charm.CharmBase, relation_name: str, mandatory_fields: list = []
-    ):
-        super().__init__(charm, relation_name)
-        self.relation_name = relation_name
-        self.mandatory_fields = mandatory_fields
-        self._update_relation()
-
-    def get_data_from_unit(self, key: str):
-        if not self.relation:
-            # This update relation doesn't seem to be needed, but I added it because apparently
-            # the data is empty in the unit tests.
-            # In reality, the constructor is called in every hook.
-            # In the unit tests when doing an update_relation_data, apparently it is not called.
-            self._update_relation()
-        if self.relation:
-            for unit in self.relation.units:
-                data = self.relation.data[unit].get(key)
-                if data:
-                    return data
-
-    def get_data_from_app(self, key: str):
-        if not self.relation or self.relation.app not in self.relation.data:
-            # This update relation doesn't seem to be needed, but I added it because apparently
-            # the data is empty in the unit tests.
-            # In reality, the constructor is called in every hook.
-            # In the unit tests when doing an update_relation_data, apparently it is not called.
-            self._update_relation()
-        if self.relation and self.relation.app in self.relation.data:
-            data = self.relation.data[self.relation.app].get(key)
-            if data:
-                return data
-
-    def is_missing_data_in_unit(self):
-        return not all([self.get_data_from_unit(field) for field in self.mandatory_fields])
-
-    def is_missing_data_in_app(self):
-        return not all([self.get_data_from_app(field) for field in self.mandatory_fields])
-
-    def _update_relation(self):
-        self.relation = self.framework.model.get_relation(self.relation_name)
-
-
-class MongoClient(BaseRelationClient):
-    """Requires side of a Mongo Endpoint"""
-
-    mandatory_fields_mapping = {
-        "reactive": ["connection_string"],
-        "ops": ["replica_set_uri", "replica_set_name"],
-    }
-
-    def __init__(self, charm: ops.charm.CharmBase, relation_name: str):
-        super().__init__(charm, relation_name, mandatory_fields=[])
-
-    @property
-    def connection_string(self):
-        if self.is_opts():
-            replica_set_uri = self.get_data_from_unit("replica_set_uri")
-            replica_set_name = self.get_data_from_unit("replica_set_name")
-            return f"{replica_set_uri}?replicaSet={replica_set_name}"
-        else:
-            return self.get_data_from_unit("connection_string")
-
-    def is_opts(self):
-        return not self.is_missing_data_in_unit_ops()
-
-    def is_missing_data_in_unit(self):
-        return self.is_missing_data_in_unit_ops() and self.is_missing_data_in_unit_reactive()
-
-    def is_missing_data_in_unit_ops(self):
-        return not all(
-            [self.get_data_from_unit(field) for field in self.mandatory_fields_mapping["ops"]]
-        )
-
-    def is_missing_data_in_unit_reactive(self):
-        return not all(
-            [self.get_data_from_unit(field) for field in self.mandatory_fields_mapping["reactive"]]
-        )