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Sometimes you need to use user's features without creating an account. So you can do it on firebase just by sending another POST request to :

https://identitytoolkit.googleapis.com/v1/accounts:signUp

But You have to enable it first

Code :

import requests

apikey='...................'# the web api key

def SignInAnonymously():
    headers = {
        'Content-Type': 'application/json',
    }
    data='{"returnSecureToken":"true"}'
    r = requests.post('https://identitytoolkit.googleapis.com/v1/accounts:signUp?key={}'.format(apikey), headers=headers, data=data)
    if 'error' in r.json().keys():
        return {'status':'error','message':r.json()['error']['message']}
    if 'idToken' in r.json().keys():
        return {'status':'success','idToken':r.json()['idToken']}

Output :

{'status': 'success',
'idToken': 'eyJhbGciOiJSUzI1NiIsImtpZCI6IjkwMDk1YmM2ZGM2ZDY3NzkxZDdkYTFlZWIxYTU1OWEzZDViMmM0'}

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