If you set your account as business account they will not ask for any documentation. After you make an order and ask for invoice they will tell you to send the documentation but they will not say you from the beginning that the specific order will have an invoice and when you ask them for the invoice they will telll you "oh im sorry the invoice will be available only from future orders"
Bad bad support...
Dear Panagiotis,
We're sorry to hear that you are satisfied with your recent experience with our store.
We would like to inform you that documentation is not a requirement to have a business account.
Said documentation becomes a requirement when further business interaction is necessary.
If you have any questions do not hesitate to contact us through the ticket system or LiveChat (available 24/7).
Best regards,
Pat