The stackable credits are part of the VanMoof Rider Referrals program. Each rider has a personal referral code that can be shared with friends, family – you name it. Each time your personal referral code is used, the new riders will be given €100/$100/£95 to spend on accessories or Peace of Mind coverage, and you’ll get €100/$100/£95 stackable credit in return. You can stack as many credits as you like, but keep in mind they expire after two years.