How to receive an invoice for accounting purposes

I have just gone Pro on Everdo.
As an entrepreneur in Germany I need a proper invoice for accounting reasons. But I only received an e-mail with the pro key.
How can I receive an invoice? Perhaps these could be auto-delivered with the key? I typed all the data into the form anyhow.
Many thanks in advance!

Sure, I have emailed to you

To anyone who may have a similar request in the future, just email Include the company name and VAT id if applicable, so that the document is generated correctly.