Auction script for an existing portal

You need to write an auction script for an existing design portal. Users should be able to add their work to the auction, and other users should be able to bid and pay for online works. After receiving payment, it should be possible to download the purchased file, 25% should be sent to my wallet, and 75% of the payment should go to the user’s wallet. It is the automated auction script with automatic payments that is of interest. There should be no balance on the site. The file was paid, the money went to 2 wallets, access to the download of the file and that's it. Please immediately assess the terms and cost and provide a portfolio.