[Python] Need Telegram Api Assistance to get Channel messages

I need the help of a Telethon api expert to solve this issue.

Here is the working code:

from telethon import TelegramClient, events, sync

api_id = 123
api_hash = 'abc123456'

client = TelegramClient('ok', api_id, api_hash)
client.start()

channel_username = 'channelusername'

for message in client.get_messages(channel_username, limit=5):
print(message.message)



The primary objective is to find the channel username from this link format:

eg. https://web.telegram.org/k/#-0123456789

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