How to parse prices from other sites?

Question

opencart

Good morning.
There is a task to parse prices from other sites and place them on your site. How can this be done?
After all, different sites have prices in different places, in different sections, etc.
For example, how does parsing exchange rates work on the same bestchange?

Answer 1

Why not use ready-made modules? they are kind of like a sea under opencart. Time and nerves are saved at the same time)

Answer 2

Use simplexml

Answer 3

YML import for Opencart