Php Penny auction script buy now issue.

If someone wins an auction via bids, they are directed to check out to pay the amount. if they decide to not pay that moment, they will receive a 'pay now' notice in their homepage that they can pay later. I also receive an invoice or notice of the transaction sent to my admin panel. The problem is: This penny auction script has the option for a user to use their bids they have spent already towards purchasing the item for the full amount (BUY NOW) if they don't win the auction. When someone chooses to buy now, the rebate is added up correctly and the user is sent to to pay the amount. If the user choose not to pay at that moment, They DO NOT receive a pay now notice to their homepage and I don't receive an invoice or notice of transaction sent to admin panel so i have no record of buy now transactions. Only money in my pay pal account! Would need someone to fix this problem for a reasonable price.