Here is a quick tutorial on how you may add items to a shopping cart on eCommerce websites using ScrapingBee API via a JS scenario on Python.
1. You would need to identify any CSS selector that uniquely identifies the button or 'add to cart' element you wish to click. This can be done via the inspect element option on any browser, more details can be found on this tutorial:
https://www.scrapingbee.com/tutorials/how-to-extract-css-selectors-using-chrome/