The exam is on premise and is done at one of your local Pearson VUE exam centers.

Here’s the link to register on Pearson VUE and this is also your lifetime referral to the certification: pearsonvue.com/openerp/

Follow all the steps. When you’re at the checkout, fill in the voucher that has been sent by your Account Manager, which will bring the price down from 400 euro to 0 euro. Then you need to register a date at the nearby exam center of Pearson VUE.

Beware that there's a lead time of 14 days between the moment you register at Pearson VUE and the first possible moment you can make an appointment with Pearson VUE exam center.

Good luck with the exam!