Create a website to sell Steam accounts

You need a simple site to resell Steam accounts with Digiseller. The design of any game is not necessarily unique. Data parsing from the Digiseller website should be carried out automatically, both the products themselves and their parameters, as well as comments and other information. Automatic update of the availability of goods for sale. The site is written in pure PHP with an OOP approach. No CMS, phpMyAdmin for data editing is quite suited.