You may need an invoice for any purchases through Font Bundles or Design Bundles.
If you have used PayPal you will usually be able to get a simple invoice there. If you would like a more detailed one you can access this via your purchases section.
Simply go here: https://designbundles.net/downloads
And click ‘download invoice’
Require an invoice with your company details?
Your invoice will not automatically include your company details unless you have updated those on your account section here: https://designbundles.net/account
To do that please enter your company information, once you have saved this, it will appear on all invoices.