A few years ago, we had a client and built a price-monitoring app for women's beauty products. They had multiple marketplaces, and like someone mentioned before, it was tricky because many products come in different sizes and EANs, and you need to be able to match them.

We built a system for admins so they can match products from Site A with products from Site B.

The scraping part was not that hard. We used our product https://automatio.co/ where possible, and where we couldn't, we built some scrapers from scratch t using simple CURL or Puppetteer.

Thanks for sharing your experience, especially that I didn't use Playwright before.