curl --request PATCH \
  --url https://{operatorDomain}/v1/admin/notifications/notification-settings \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "remindersEnabled": true,
  "defaultChannel": "email",
  "quietHours": {}
}
'

{
  "remindersEnabled": true,
  "defaultChannel": "email",
  "quietHours": {}
}