After retrieving all the text data from the webpage (using a headless browser), GPT is used to filter out all the noise and extract the actual information requested in the request schema. Let's say you request for {"product_name": "string"}. GPT will retrieve that product name from the webpage and return the correctly formatted JSON with the fields you requested.

It works pretty similarly to GraphQL when you define a schema that you want, and the backend returns the exact data that you requested. But in this case, the data is received from the webpage that you provided.