Update in the payment processor plugin in wordpress site

There is an “order pending email” triggered when the transaction through “credit card option” doesn’t go through in our website. So along with the “order pending email”, their should be a “popup” generated in the checkout page with some text on it when the transactions doesn’t go through or any error message is displayed like “name on card is wrong” or “transaction failed” or anything else ( i mean everytime when the transaction will not go through). Popup should be a beautiful one with a button link on it. Let me know if you’re interested on this project.