Hi,
I suppose that you're talking about the PayU India payment plugin we provide for HikaShop, is that correct ?
I couldn't find any information about the possibility of doing this with the PayU India API we're using in the plugin.
So I'm not sure it's even possible without having to actually write a completely different plugin for another API of PayU.
Supposing that it's possible, I suppose you'll have to change the code in the file plugins/hikashoppayment/payuindia/payuindia_end.php
