If you need to customize your Wasabi billing invoice to include (for example) a VAT number, you can do this via from the Wasabi Management Console via the Billing option on the left side of the console. Choose Billing, then on the Billing Preferences Tab you may choose Customize Invoice. A sample screen shot is provided below. This customization only affects invoices that are generated after the customization has been done. It is not possible to change previously generated invoices.
Note that the Address on an Invoice is taken from the address on the Credit Card associated with your account. That may not be changed separately.