Problem with online payment gateway.

Question

Dear all,

               I am developing a website where i need a link button on payonline.aspx page.When ever user click on this link the page should be redirected to the 

bank payment gateway.I have all the necessary things like asp.net support file given from the particular bank.My problem is how to implement this gateway on this page.(Note: I don't want to take any bank details from user and also don't want to store all the data.)