Geekbot stores all payment information in the main dashboard under Billing. If you want to see information relating to a specific invoice, click the 'Invoices' tab where you'll find a full list of all your invoices that includes the:
Date of the invoice
Invoice number
Total amount billed
You can download any invoice by clicking 'Download' on the right-hand side — as you can see in the image below.
If you find your invoices tab is empty, you might not have added your billing information — but worry not: you just need to add your credentials, and all your existing invoices will magically appear 💫