partition by org_id and add auth

lib/customer_service/customer/queries.ex

@@ -2,12 +2,13 @@ defmodule CustomerService.Customer.Queries do
   alias CustomerService.Projections.Customer
   alias CustomerService.Repo
 
-  def list_customers(params \\ %{}) do
+  def list_by_org(org_id, params \\ %{}) when is_binary(org_id) do
+    params = Map.put(params, :org_id, org_id)
     Flop.validate_and_run(Customer, params, for: Customer)
   end
 
-  def get_customer(id) do
-    case Repo.get(Customer, id) do
+  def get_by_org(org_id, customer_id) when is_binary(org_id) and is_binary(customer_id) do
+    case Repo.get_by(Customer, org_id: org_id, customer_id: customer_id) do
       nil -> {:error, :not_found}
       customer -> {:ok, customer}
     end