I have an html page with a button called Donate. When the user clicks on that button an aspx page opens up in a pop up window. The aspx page contains data which is filled in by the end user. When the user clicks on the Submit Payment button the backend code calls PayPal's PayFlow Pro API to processes that information. If the transaction is successful it returns an Authentication Code. I would like to pass this Authenticate Code back to the HTML page.
Is there anyway I can achieve this ?