FastSpring - payment processing

I need someone who will implement payment processing at my site. I want to sell one video. I have chose [login to view URL] as merchant. Video file is located on address [login to view URL] below the picture follow the link Watch VIDEO. For now that video is protected with password. The process is: customer make payment, then he will receive email about payment details and order ID. Then he need to type that ID so he can watch a video. I need a script that will check payment on FastSpring and put that ID in database. Also I need to protect that video from unauthorized visitors. Only the person who make a payment can watch that video in next 2 days.