Opencart Integrated Activation Key Sender via Email

I need a new software/extension that is to be used on Opencart for my website. The extension (as I will call it for simplifying), must be able to sync with the orders that come through a specific category on my website; www.store.gameagency.co.uk. If the correct order is placed, the extension must be able to find an unused text file or unused image file (depending on what is available - both must be usable if needs be) that contains an activation key to activate PC games online. It must be able to sync with the order list and find the customer's name and email address and will send them an email directed to them personally (by adding their name on the top of the email) that contains an attached image or text file. This sending process must be delayed for 15 minutes before sending the code for security purposes. Also, for certain games there will be an additional text file which will have instruction to install the key. There must be an area where I will be able to upload new keys into their specific games. Each game must have a separate database so that all the keys are separate for each game and they don't get mixed together. It must be an automated system that works 24 hours a day, everyday. If the keys are not available it must send the customer an email telling them that it is currently out of stock and will be back soon. Thank you