This article contains information about how to view your Midphase billing invoices.
To view your billing invoices for your account log into https://secure.mpcustomer.com with your billing username(client ID) and password. Then Click 'View Invoices - Billing and services' -> 'View Invoices' -> select 'View All Invoices' from the dropdown menu on the right-hand side. This will show all of your invoices.