Issue with oAuth in docusign in django python - django

Question

The issue is while requesting for token, we are getting the "Invalid Grant" error (Response - 400).
Please find attached the python code which we are using for the same.
We also tried same with postman and getting the same error message.
We also added callback url on docusign panel
Please see below the code :-
import json
import requests
from django.core.mail import send_mail
from django.shortcuts import render, redirect
from django.http import HttpResponse, HttpResponseRedirect
import base64
from .utils import return_csv_values, np, get_current_day_month, return_csv_values_application
from .process_docments import embedded_signing_ceremony_contract, embedded_signing_ceremony_application
import pandas as pd
from .models import DocumentSigned
CLIENT_AUTH_ID = 'my integration id'
CLIENT_SECRET_ID = 'my secret id'
# Create your views here.
def get_access_token(request):
base_url = "https://account-d.docusign.com/oauth/auth"
auth_url = "{0}?response_type=code&scope=signature click.manage organization_read permission_read dtr.documents.read&client_id={1}&redirect_uri={2}" \
.format(base_url, CLIENT_AUTH_ID, "http://127.0.0.1:8000/auth_login")
# print(request.build_absolute_uri())
return HttpResponseRedirect(auth_url)
#callback url
def auth_login(request):
access_code = request.GET['code']
# return HttpResponse(access_code)
base_url = "https://account-d.docusign.com/oauth/token"
auth_code_string = '{0}:{1}'.format(CLIENT_AUTH_ID, CLIENT_SECRET_ID)
print(auth_code_string)
auth_token = base64.b64encode(auth_code_string.encode('utf-8'))
auth_token = auth_token.decode("utf-8")
print(auth_token)
req_headers = {"Authorization": "Basic {0}".format(auth_token), "Content-Type": "application/x-www-form-urlencoded"}
post_data = {'grant_type': 'authorization_code', 'code': access_code}
try:
r = requests.post(base_url, data=post_data, headers=req_headers)
print(r)
return HttpResponse(json.dumps(r))
except Exception as e:
print(str(e))
return HttpResponse(str(e))

Answer 1

this is the code I use, note a few differences from what you're doing:
string endpoint = string.Format("{0}/oauth/token", accountServerUrl);
var values = new Dictionary<string, string>();
values.Add("grant_type", "authorization_code");
values.Add("code", token);
if (redirectUri != null)
values.Add("redirect_uri", redirectUri);
var content = new FormUrlEncodedContent(values);
var auth = string.Format("{0}:{1}", clientId, clientSecret);
var bytes = System.Text.Encoding.ASCII.GetBytes(auth);
var encodedAuth = Convert.ToBase64String(bytes);
httpClient.DefaultRequestHeaders.Add("Authorization", string.Format("Basic {0}", encodedAuth));