How to implement a parser for a large online store?

Question

Parsing

You need to select and link an online store parser like gearbest or jd.ru to your modx template.
I know PHP, javascript and java quite well, I understand python and C.
The parser itself must collect data about the product (picture, name, price, description and characteristics).
Can you tell me in what language or in what ready-made template it would be better to implement this idea? The main thing is that the parser can function as long as possible and after, say, changing the identifiers of the goods, it would be enough just to edit the parser and continue using it.
You have 6 days to do this.