An invoice is a document that maintains a record of a transaction between the user & Recruiterflow in regard to your bills & payments.
You can check for the invoices under ’settings’, select the 'Billing’ Tab on the left and you can see a section for 'Invoices'.
Here you can check for your:
Invoice number
Status ( If the invoice is paid or not )
Amount ( Cost for the Invoice )
Due ( Amount remaining to be paid )
Created ( When the invoice was created )
And you can Download the Invoice as well.