Only the FIRST to use a referral code in this round of the referral program will receive the credit toward service or accessories. A clever step by Tesla, because that way there is just no point at all that the same referral code is used more than once. There will be NO credit if the order is placed on the "Other Europe" version of the Tesla website (locale /en-EU). This may be a mistake by Tesla, but it definitely says "Free Unlimited Supercharging and a € 0 Credit" and no mention of the credit in the design studio, so I would avoid placing an order using that version of the website. If you place an order in Macau, you still get the full HK$8,800 credit (equivalent of US$1,000) toward a new Model S or X, so that one is not just an account credit toward service or accessories, but gets deducted from the purchase price, as it was till last year all around the globe. The Tesla website does not tell that the one subscribing to the Tesla Newsletter will get a chance to race the semi truck together with the owner of the used referral code, but that each individually gets a chance. Seeing in the Leaderboard that someone has already 1200 entries on the present day it would not be possible otherwise.