Retrieving annual reports using Eikon API

I would like to download the annual reports for a list of U.S. companies using an Eikon API. I read through this article which seems to describe the general process:

https://developers.refinitiv.com/en/article-catalog/article/introduction-to-filings---python

The article only refers to SEC filings. Is it also possible to download a company's annual report instead of its SEC filing?

I am just getting started using the API and am currently stuck at the second section of the article "Define Token Handling and Obtain a Valid Token". My current code is:

import eikon as ek
import numpy as np
import pandas as pd
ek.set_app_key('EIKONAPPKEY')
USERNAME = "EIKONLOGINUSER"
PASSWORD = "PASSWORD"
CLIENT_ID = "EIKONAPPKEY"

I don't really understand the first line of the Token Handling section:

TOKEN_ENDPOINT = RDP_BASE_URL + CATEGORY_URL + RDP_AUTH_VERSION + ENDPOINT_URL

At this point I get the error that RDP_BASE_URL is not defined which of course makes perfectly sense. I read through the suggested Authorization tutorial but still struggle to understand how this works and how to solve this issue. I thought the code under section 2 of the linked article includes the steps for creating a token? I would highly appreciate some help.