I just added the lenses to "cart", and then ordered the items from "cart". There is also option to ask quotation in website, but I didn't see any point doing that; I'm one-time customer who ordered 5 lenses -> they have no reason to give me 50% discount... So I skipped that and ordered directly.
Then somebody emailed how to pay (IBAN stuff), and I paid and then I got delivery date confirmed. They don't have modern webshop where you can pay with credit card / Paypal, and I understand it as they are normally NOT dealing with normal consumers, they are 99,999% in B2B market.
Then just waited and lenses were delivered to my home. Very easy, and no customs etc. hazzle as they ship from France.