You can request an invoice when booking your ticket. In the Payments section you have a dedicated button. If you check this option, after you select the card type and click on the Continue button, you will be redirected to an intermediate page where you can insert the invoice details.
The form becomes editable after you select the customer type and country of residence. After filling the form you can continue with the payment of the ticket and the invoice will be automatically sent to the email address in the form.
If you didn`t request the invoice during boking you can submit a claim through our contact form Submit a request – Support Center (flyblueair.com).