If you need a copy of the Azure invoice emailed to you then you can configure that inside your Azure portal be navigating firstly to the Cost Management + Billing.
Then select Invoices from the menu on the left.
Finally, select Invoice email preferences from the menu on the right then enter the desired email address on the right in the dialog that appears. Remember to save your changes and from now on that email address will receive a copy of your Azure invoice monthly.
CIAOPS 