I want to get notified when the website data changes

Hello everyone
I want to get notification via email whenever the website start selling that product again.

Website have userid and password to login.

I am trying nbrowser node but its not working.
can someone please help me regarding the topic. ?

Thanks in advance.

Regards
Nipun

Which website? If it is Amazon or eBay, there are 3rd-party sites that will do that for you. Not sure about AliExpress/Banggood.