Your invoices are stored on the bottom of your billing page. If you have multiple email accounts with SignRequest please make sure you're logged in to the correct account as the other accounts will not have your invoices.
If you have a plan with separate charges (per document pricing or text messages) we also add an attachment with details of these charges.
How to automatically send your invoices to a different email address?
If you would like to send the invoice for your account automatically to your finance department you can add this email address on your billing page.