By default invoices are sent to the account owner's email address unless this is changed during account setup or on the settings page. You can view and change the address we send invoices to by logging in to your account, navigating to the settings page, and then selecting the billing subsection of settings.
If you need a copy of an invoice or receipt, please go to your Account Settings, click on Billing & Invoices, then locate the Invoices & Receipts section.