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How to logout / signout from firebase auth with python flask

I am Creating a simple login, logout, signup flask web app using firebase auth and I successfully created login and signup but stuck in logout. So is there any way to log out or sign out from firebase auth?
Thanks

There is no way to invalidate a specific token, however you can invalidate the refresh token (refer this article)
But that doesn't seem to be your problem. So, Simply the best way to go about this would be to delete the token or forget the user from client side :
auth.current_user = None
After the user is set to None, the requests will not be authenticated and hence it's more like the user has logged out.
Still, if you want to implement this for some specific case, there is a workaround you can refer here

When you log in with firebase, it typically gives you a refresh token and an id token. These are JWT's that identify the user and the other refreshes the id token when it expires as the id token expires after 1 hour.
If you are using something like PyreBase
auth.current_user = None is not secure.
Instead, you should look at the sign out method provided.
import pyrebase
firebase = pyrebase.initialize_app(config)
auth = firebase.auth()
user = auth.sign_in_with_email_and_password(email,password)
auth.signOut()

Searching for users in Foursquare API- Missing credentials error 401

Please help. I am trying to search for a specific user in Foursquare but for some reason I got Missing credentials error 401.
user_id = '484542633' # user ID with most agree counts and complete profile
url = 'https://api.foursquare.com/v2/users/{}?client_id={}&client_secret={}&v={}'.format(user_id, CLIENT_ID, CLIENT_SECRET, VERSION) # define URL
# send GET request
results = requests.get(url).json()
user_data = results['response']['user']
# display features associated with user
user_data.keys()

As documentation states, this endpoint is meant to be accessed on behalf of the user:
This endpoint requires user authentication.
User calls require a valid OAuth access token in the query string of each request instead of the Client ID and Secret (&oauth_token=XXXX).
For more information about this authentication method and how to obtain an access token, see the Authentication docs.
This means v2/users can only be accessed by your app, after a user (which can be you, using your own Foursquare account) goes through the OAuth login flow and grants necessary permissions. OAuth doesn't mean your app "logs in" as the user, rather that the user has given you permission to do something on their behalf.
To learn more about OAuth you can watch this talk: https://www.youtube.com/watch?v=996OiexHze0
To read more about Foursquare's API visit their documentation site: https://developer.foursquare.com/docs/api/

Avoid login auth in Docusign

For regular flow: a user has to login (in docusign view) to get a code to get token and upload his docummnet.
I want to user my personal account to get this token without login in docusign view. Is there a way to do this?

You can use JWT for this.
"In the JWT bearer authentication flow, your application posts a JWT to the DocuSign authentication service, asserting its credentials and providing the data of the user that it wishes to impersonate (act on behalf of). DocuSign validates that the assertion is signed and that your application has the permission to act on behalf of the user, then issues an access token that allows you to call DocuSign APIs."
https://developers.docusign.com/esign-rest-api/guides/authentication/oauth2-jsonwebtoken

Facebook Login in Django Backend with big Frontend separation.

I'm trying to make a login with Facebook.
What I want is to create and endpoint and use it as I use the "standard" email login endpoint, since I need a big separation between the backend and the frontend.
I think it should be easy to do it, but I don't know how to do it.
I read this and when I use the Url in the browser, it works properly and I get the token in the response Url. But, it happens always on the frontend side.
I tried many tutorials this one is an example, and it works, but I'm the backend, I'm not allowed to have something like that, as the frontend is written in Django too.
So, I don't know how should be the workflow when you're just the Backend, I don't know what the Frontend developers wait from me because the authentication happens actually on the frontend side.
And I'm a little bit lost.
Maybe someone had the same problem as Backend and could help me, at least tell me, how the workflow backend - frontend should be.

Facebook JavaScript/Android/iOs SDKs lets the client to authenticate the users. Once the user is authenticated with facebook, your clients can send the accessToken through a HTTP POST over https.
This is what I have done in a similar situation,
At backend,
Create API endpoint to authenticate user by validating their accessToken,
POST /auth/
Use this endpoint to verify the accessToken sent by the client. The token should be validated calling Facebook services with your app secret. Once done validating, return a response as a JSON detailing the status of the authentication and user identification details if successful.
on the request,
body should contain accessToken as a key/or a header
Content-Type header should be application/json
any additional expected headers must be validated
on the request try to include
status of the operation
user identification detail if operation is success
a JWT or some sorta token to identify the user which users can include in Authorization header, so that you can validate the request just buy validating the token against User. Set an expiry as the accessToken if JWT is expired, refresh accessToken at client side and validate again.
At Frontend.
Let the client do the following to authenticate themselves.
send accessToken to /auth as a POST request.
if authentication status is success, let them store the JWT in locally and use it on the upcoming requests.
at backend on upcoming calls,
if token is expired or tampered, redirect client to authenticate with Facebook again.
on logging out of user, delete the token from client.
So for the frontend developers,
Document your API properly and share it with them

Tweet on behalf of users who have authenticated my app to post tweet?

I have an app, using this app in which user can sign-up via twitter and I have set permission of Read, write, and direct messages , So when user sign-up to my project he authorized me that I can post on-behalf of him. Also during signup I have got his oauth-token and oauth-token secret.
But I don't know how I can post tweet on behalf of that user. I try to submit a form at https://api.twitter.com/1.1/statuses/update.json with parmas like status , my app key and secret , user oauth_token and secret but in response I am always getting this
{"errors":[{"message":"Bad Authentication data","code":215}]}
I am using python-social-auth for sign up via twitter.
Any help would be appreciated.
Thanks

You need to specify the user access_token with your request, that's the way Twitter knows which is the current authenticated user. With python-social-auth you can do:
# given a user instance (and assuming Django ORM)
social = user.social_auth.get(provider='twitter')
backend = social.get_backend()
form_data = {
'status': 'The new twitter status goes here'
}
response = backend.get_json(
'https://api.twitter.com/1.1/statuses/update.json',
method='POST',
auth=backend.oauth_auth(social.extra_data['access_token']),
data=form_data
)