Browser based extension for shopping deals and coupons

[Ram]

Hi,

Many of you know browser extensions like honey, rauketen, couponcabin, price blink and etc. I would like to know what kind of technology they use to extract shopping deals and coupons from different online retailers and ecommerce sites. We are developing web app and currently using APIs to integrate into our Web App and then extracting the desired data. We are wondering whether the above apps are crawling or scrapping the web to get all those Coupons, shopping deals and price comparision or is there another possibility? I appreciate if you could share your knowledge on this?

Best regards,

~Ram