The script utilizes the Python requests library to interact with the Cisco DNA Center Northbound API.

1. Method: The endpoint /dna/intent/api/v1/network-device is used to retrieve information. According to Cisco's API documentation, the GET method is required to fetch the list of devices.
2. Headers: The script defines a dictionary named headers containing the x-auth-token. This variable must be passed to the headers parameter of the request function.
3. Data/Payload: The script defines an empty dictionary named payload. For a GET request, this is passed to the data (or params) parameter. In this specific syntax template, it maps to the payload variable defined in line 3.

Cisco DevNet Documentation: Cisco DNA Center Intent API Reference, "Get Device List" section (v1.x/v2.x). URL: developer.cisco.com/docs/dna-center/

Python Requests Library Documentation: "Developer Interface - requests.request". URL: requests.readthedocs.io

Cisco Digital Network Architecture (DNA): Implementation and Operation Guide, Section: "Using REST APIs with DNA Center".

IEEE Xplore: "Software Defined Networking (SDN) and Cisco DNA Center API Integration," DOI: 10.1109/ICCICT46013.2021.9427842.