Hi,
The Information is stored as JSON and returns the ID saved in DB.
You can use it to read from DB:
UpiCRMLeads :: get_by_id ($ lead_id)
What is relevant mostly is lead_content.
If you want to get all the information (data) by fields of UPI, then it is a little more complex.
You can look for function wp_ajax_excel_output_callback in upicrm_admin_lists file.
There is a loop that starts like this:
foreach ($ getLeads as $ leadObj)
This will certainly be a good starting point…
Does that help, or do you need more assistance?