How to set card detail in payment means matrix

I'm trying to set the card detail in payment means window which is received from pos.

I have tried the below code

oMatrix.Columns.Item("63").Cells.Item("1").Specific.value="1234"

But i'm getting invalid row index. I have hard coded the row index as 1. As the each column has only one index.

Could you please help me on this.

Thanks in advance.