求助！雅典去圣岛轮船Bluestar ferries 网上订票用

各位大神，


当我用我老公信用卡付完船票钱后，收到BLUESTAR 的邮件，里面有这么一句：If the payment card holder is not collecting the tickets himself, they will have to provide a signed letter,duly notarised (authentication of signature), giving permission for ticket collection, with the named party bringing ID. 那个授权信真的要公证吗？还是我自己打一份签个字就行了？反正谁签字他们也看不出。。。