Unable to authenticate LinkedIn Python API client using Oauth2.0

I'm trying to authenticate the LinkedIn API to retrieve data from company pages using my LinkedIn App credentials.

Under Oauth 2.0 settings:

Redirect URLs: http://localhost:8000/

Wasn't entirely sure which URLS to add in above.

from requests_oauthlib import OAuth2Session
from requests_oauthlib.compliance_fixes import linkedin_compliance_fix


# Credentials you get from registering a new application
client_id = '*********'
client_secret = '********'
redirect_url = 'http://localhost:8000/'

# OAuth endpoints given in the LinkedIn API documentation (you can check for the latest updates)
authorization_base_url ='https://www.linkedin.com/oauth/v2/authorization'
token_url = 'https://www.linkedin.com/oauth/v2/accessToken'

# Authorized Redirect URL (from LinkedIn configuration)
linkedin = OAuth2Session(client_id, redirect_uri=redirect_url)
linkedin = linkedin_compliance_fix(linkedin)

# Redirect user to LinkedIn for authorization
authorization_url, state = 
linkedin.authorization_url(authorization_base_url)
print('Please go here and authorize,', authorization_url)

# Get the authorization verifier code from the callback url
redirect_response = input('Paste the full redirect URL here:')

# Fetch the access token
linkedin.fetch_token(token_url, client_secret=client_secret,
                 authorization_response=redirect_response)

# Fetch a protected resource, i.e. user profile
r = linkedin.get('https://api.linkedin.com/v1/people/~')
print(r.content)

After opening the URL and logging in & authorizing the client, I keep getting this error: InvalidClientIdError: (invalid_request) A required parameter "client_id" is missing

I'm sure these are the most up to date URLs to use for LinkedIn