How will I receive my credit for a referring another customer? December 19, 2018 13:47 Updated Your referral voucher will be emailed to you and added to your customer profile. Related articles Can I earn a referral voucher for friends or family that are going on the same cruise with me? How does the referral program work? Is there a limit to how many referral vouchers I can earn? So many cruise lines - which one should I choose?