I am working on a django webapp. I connected the paytm payment gateway with the django app. I did everything according to the docs, and everything works. almost.

I am having a problem when calling the callback URL once the payment is over.

Here is the code

views.py

def donate(request):
    if request.method == "POST":
        form = DonateForm(request.POST)

        name = request.POST.get('firstName')
        phone = request.POST.get('phone')
        email = request.POST.get('email')
        amount = float("{0:.2f}".format(int(request.POST.get('amount'))))
        ord_id = OrdID()
        cust_id = CustID()

        paytm_params = {
            "MID" : MERCHANTID,
            "WEBSITE" : "WEBSTAGING",
            "INDUSTRY_TYPE_ID" : "Retail",
            "CHANNEL_ID" : "WEB",
            "ORDER_ID" : ord_id,
            "CUST_ID" : cust_id,
            "MOBILE_NO" : phone,
            "EMAIL" : email,
            "TXN_AMOUNT" : str(amount),
            "CALLBACK_URL" : "http://127.0.0.1:8000/handlerequest/",

            }

        paytm_params['CHECKSUMHASH'] = Checksum.generate_checksum(paytm_params, MERCHANTKEY)

        return render(request, 'paytm.html', {'paytm_params': paytm_params})

    else:
        form = DonateForm()
        context = {'Donate': form}
        return render(request, 'donate.html', context=context)

@csrf_exempt
def handlerequest(request):
    form = request.POST
    response_dict = {}

    for i in form.keys():
        response_dict[i] = form[i]

        if i == 'CHECKSUMHASH':
            checksum = form[i]

    verify = Checksum.verify_checksum(response_dict, MERCHANTKEY, checksum)

    if verify:
        if response_dict['RESPCODE'] == '01':
            print('order successful')
        else:
            print('error: ' + response_dict['RESPMSG'])

    return render(request, 'paymentstatus.html', {'response': response_dict})

urls.py

path('donate', views.donate, name='donate'),
path('handlerequest', views.handlerequest, name='handlerequest'),

donate.html

<form class="test_paytm" action="{% url 'donate' %}" method="post">
    {% csrf_token %}
    <div class="row">
        <div class="col">
            {{ Donate.firstName|as_crispy_field }}
        </div>
        <div class="col">
            {{ Donate.lastName|as_crispy_field }}
        </div>
    </div>
    <div class="row">
        <div class="col">
            {{ Donate.email|as_crispy_field }}
        </div>
        <div class="col">
            {{ Donate.phone|as_crispy_field }}
        </div>
    </div>
    <div class="row">
        <div class="col">
            {{ Donate.amount|as_crispy_field }}
        </div>
    </div>
    <button type="submit" name="button" class="btn btn-lg mb-5 contact_submit">Donate</button>
</form>

paymentstatus.html

<div class="container">
  {% if response_dict.RESPCODE == 01 %}
  <center>
    <h2>Thank you for your donation</h2>
    <p>
      We are thrilled to have your support. Through your donation we will be able to accomplish our goal. You truly make the difference for us, and we are
      extremely grateful!
    </p>
  </center>

  <h3>Order ID: {{response_dict.ORDERID}}</h3>
  <h3>Order Date: {{response_dict.TXNDATE}}</h3>
  <h3>Amount: {{response_dict.TXNAMOUNT}}</h3>
  <h3>Payment Mode: {{response_dict.PAYMENTMODE}}</h3>

  {% else %}
  <center>
    <p>
      There seems to be a problem. We will try to fix this from our end.
    </p>
  </center>
  {% endif %}
</div>

But once the payment is over, The website is not calling handlerequest from views.py correctly. That is why I had added the @csrf_exempt so that an outside page can call the url without any issues. But I am still getting the 403 error. I am not sure what I am doing wrong