You can view all of your invoices from within your Fixflo account.
To view these you need to simply do the following:
Setup > Billing Details
If you then go to the 'Invoices' tab you will be able to see a list of all of your invoices and download a copy of any.
Whoever is listed as your main billing contact will also receive all emails related to invoices. You can see who this person is under Billing Contact and amend if necessary.