Need to build a custom system for wordpress that will link to all of my affiliate accounts or scrape websites and auto update prices and auto add new items..

I have a price comparison website. My website is built on wordpress using a "rehub" theme. There are several websites where i need to add over 500k+ items from multiple sites. It needs to do it in a way so google wont ban my website . This system needs to auto add items from all of these sites. Auto put into the correct categories when set. Auto update prices and auto add new items added by companies in the right categories. You would be using my affiliate link for each different site. Lots of sites don't like bots crawling and have captcha codes so we will have to resolve this as well. Some affiliate accounts we can download items. Linking to api would need to be custom for each site i make unless you are scraping each website. I also need amazon products but unless you make sales you can't access their api yet. When users land on the product pages it needs to show the cheapest item for what they're viewing. And show the other same items next to it and have the stores logo beside it. NOTE: I have content egg. affiliate egg and those don't work for what i need so this would need to be a custom built system that can be easily managed and edited. Brands and brand logos need to be on the site as well.