For most of our shipments, we charge your payment method on file (ACH, credit card) when you book your shipment so that we can pay our partner carriers upfront (and increase reliability for you).
If you need to find the invoice for any particular shipment, you can go to the "Billing" section of your dashboard, click on the shipment and view the details, as well as any relevant documents (proof-of-delivery, invoices). The documents are located at the bottom of that page.
Since payment occurs at booking, these invoices reflect what has already been paid for services rendered.
We also send a weekly summary of your shipments and charges to any manager/shippers or accountants associated with your account each week.