Every charge produces an invoice, and they are all available in the portal.
Finding them
Open Billing. Your invoice history is listed there, most recent first, and each one can be downloaded as a PDF.
What is on them
The period covered, what was charged, your billing address and the payment method used. Credit pack purchases appear as their own entries, separate from your subscription charges.
Getting them to finance without giving away everything
Use the Billing-only role. Someone with it can see and download every invoice and manage the payment method, and cannot see your websites or any scan result. It is the right answer to "our accounts team needs the invoices" and much better than sharing an Owner login.
Changing details on an invoice
Invoices are generated from your billing details at the time of the charge, so an address change applies to future invoices, not past ones. If an already issued invoice has to be corrected for your accounts, contact support.
Next
Read When a payment fails.