Payzone payment gateway Transaction Problem

Question

I have used the payment gateway of Payzone in my project and I have integrated it successfully(according to me). I have tested the online payment with Test Cards provided by Payzone and the transaction was successful. 

 

The problem is that when doing payment with Real Cards(Not Test Cards) getting the following response:

 

 

 

But with Test Cards getting the following response:

 

 

 

 Kindly help what to do? I am stuck in this.