def ensure_graph_for_app_only_auth(self):
 #Ensure that the class is set up for app-only authentication using a client secret.
 #Initializes client credentials and the app client if not already set.
 if not hasattr(self, 'client_credential'):
 client_id = self.settings['clientId']
 tenant_id = self.settings['tenantId']
 client_secret = self.settings['clientSecret']
 self.client_credential = ClientSecretCredential(tenant_id, client_id, client_secret)
 if not hasattr(self, 'app_client'):
 self.app_client = GraphClient(credential=self.client_credential,
 scopes=['https://graph.microsoft.com/.default'])

 def get_groupmembers(self, gid):
 """
 Retrieves members of a group specified by its ID.
 Args:
 gid (str): ID of the group.
 Returns:
 dict: Dictionary containing details of group members.
 """
 self.ensure_graph_for_app_only_auth()
 members_endpoint = f'/groups/{gid}/members'
 members_response = self.app_client.get(members_endpoint)
 all_members = []
 while members_response:
 members = members_response.json().get('value', [])
 all_members.extend(members)
 next_link = members_response.json().get('@odata.nextLink')
 if next_link:
 members_response = self.app_client.get(next_link)
 else:
 break
 return {"value": all_members}