Hi,
i assume you want to automate the process of filling form for PNR and GST numbers
and save the results to excel and file to local drive.
This is possible using imacros, a Firefox addon. but need to do a test/trail.
let suppose you have excel file with two columns, one column for PNR and other for GST
the script will pull both values from excel and auto fill form and hit enter, save results to excel, and download pdf to local driver.
Note: the pdf file is already a unique name, it is using invoice number as reference.
Available for discuss and ready to start.
Regards
Imran