急！请问文莱航空公司购买过程中CSC的问题

购买文莱航空公司机票的时候要求填写 Indicates required fields，可是怎么也填不对，填CVV不对，下面是他的一个举例：
The CSC (card security code) is a 3- or 4- digit code found on your credit card that helps ensure your credit card is present when your purchase is made. For Visa and MasterCard Cards the CSC number is the 3-digit value printed on the signature panel on the back of your card immediately following the credit card account number. For American Express Cards the CSC number is the 4-digit, non-embossed number printed above your account number on the face of your card.

Visa and MasterCard
0000 0000 0000 0000 123

这后面三位数到底是什么，到底应该填写什么东东？我是工行的卡
很急，有知道的请告诉一声。谢谢。坐等