请问签证费的寄送方法

学校发来的邮件上说：As soon as we have received Euro 250 we can start the visa application procedure for you. Make sure that the transfer costs are on your account.  “If paid by money order, please keep the original receipt. ”这最后一句的意思我怎么弄不明白，因为如果是票汇也就是MONEY ORDER,那么要寄去原始的票才能拿到钱，那为什么他说要让我保存原始的票呢？KEEP THE ORIGINAL RECEIPT.?因为用电汇要多交钱，我想省一些用票汇，但又出现了这个小问题，望知情者帮我解答，谢谢！

  receipt是收据的意思。

建议电汇，快速、安全。