How will I receive my credit for a referring another customer? October 29, 2018 15:14 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? How do I pre-register with the cruise line? What is my "up to $750 Onboard Credit" amount?