From telethon.sync import TelegramClient from telethon import functions, types with TelegramClient(name, api_id,

Question

From telethon.sync import TelegramClient from telethon import functions, types with TelegramClient(name, api_id,

api_hash) as client:
result = client(functions.phone.JoinGroupCallRequest(
call=types.InputGroupCall(
id=-12398745604826,
access_hash=-12398745604826
),
join_as='username',
params=types.DataJSON(
data='some string here'
),
muted=True,
video_stopped=True,
invite_hash='some string here'
))
print(result.stringify())

what is access hash and where i can get it ??