[Python] Making an API Request with python based on Mozilla Authentication

I'm creating a class called AnbimaApiClient , aiming to facilitate data requests for the Anbima API (api documentation link: https://developers.anbima.com.br/en/autenticacao/). I've successfully implemented a method called _get_new_anbima_token that generates an access_token for the api calls. The problem is in the get_fidc_method.

The objective of this function is to pull data of Brazilian hedge funds based on a unique identification code (called CNPJ). (Here is a link on the documentation of how the API pulls data of hedge funds: https://developers.anbima.com.br/en/apis-de-fundos-2/#submenu-titles-2).

The code


import requests as r

from requests_oauthlib import OAuth2Session
from oauthlib.oauth2 import BackendApplicationClient

import os, json, oauthlib


class AnbimaApiClient:


__client_id = "client_id"
__client_secret = "client_secret"
__client_access_token = 'client_access_token'
__token_url = 'https://api.anbima.com.br/oauth/access-token' # token generation
__fidc_url = 'https://api.anbima.com.br/feed/fundos/v1/fundos-estruturados' # url that I'm trying to
# pull data from

def __init__(self):

client = BackendApplicationClient(client_id=self.__client_id)
self.oauth = OAuth2Session(client=client)
self.session = r.Session()

# setting session headers
self.session.headers.update({
'Content-Type': 'application/json',
"Authorization": f"Basic {self.__access_token}"
})


def _get_new_anbima_token(self, only_token=True):

# NOTE: This is working perfectly
token = self.oauth.fetch_token(token_url=self.__token_url,
client_id=self.__client_id,
client_secret=self.__client_secret)

if only_token:
return token['access_token']

return token

def get_fidc_data(self, field, value):

params = {
field: value
}

response = self.session.get(self.__fidc_url, params=params)
return response.text

def main():

"""
A simple test of the get_fidc_data method
"""

anbima_client = AnbimaApiClient()
data = anbima_client.get_fidc_data('cnpj_fundo', '29.494.037/0001-03')
print(data)

if __name__ == '__main__':
main()


The problem


Every time I run this script, this is the output of the response.text:

Could not find a required APP in the request, identified by HEADER client_id.


I know that the API follows this authentication process because it's what's written in the API documentation: "The authentication type must be 'Basic Authentication', as specified in: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Authorization." I've tried passing client_id as auth, in the headers but still nothing worked.

What am I getting wrong here? Is in the headers?

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