Django redirecting

I can't figure out why my redirection after paying doesn't work. I'm trying to display the thank_you template once the user has paid via Paypal. My code all works other than the final render of the thank_you template (I receive the email and see the 'Made it' print statement).

Urls:

from django.urls import path
from . import views


app_name = 'checkout'

urlpatterns = [
    path('', views.checkout, name='checkout'),
    path('thank_you', views.thank_you, name='thank_you'),
    path('order_success', views.order_success, name='order_success'),
]

Views.py:

import json

from django.shortcuts import render, redirect, reverse, HttpResponseRedirect
from django.http import JsonResponse
from django.contrib import messages
from django.urls import reverse
from profiles.models import UserProfile
from products.models import Product
from django.views.decorators.http import require_POST
from .models import Order, OrderDetail
from django.core.mail import send_mail
from the_rescuers.settings import DEFAULT_FROM_EMAIL
from templated_email import send_templated_mail

from .forms import OrderForm


def checkout(request):
    bag = request.session.get('bag', {})
    if not bag:
        messages.error(request, "There's nothing in your bag at the moment")
        return redirect(reverse('products:products_list'))
    order_form = OrderForm()
    bag_products = []
    for item_id, quantity in bag.items():
        product = Product.objects.get(pk=item_id)
        name = product.name
        id = product.id
        bag_products.append({'name': name, 'id': id, 'quantity': quantity})
    bag_products = json.dumps(bag_products)
    # Attempt to prefill the form with any info the user maintains in
    # their profile
    if request.user.is_authenticated:
        profile = UserProfile.objects.get(user=request.user)
        order_form = OrderForm(initial={
            'first_name': profile.default_first_name,
            'last_name': profile.default_last_name,
            'email': profile.default_email,
            'phone_number': profile.default_phone_number,
            'country': profile.default_country,
            'postcode': profile.default_postcode,
            'city': profile.default_city,
            'street_address_1': profile.default_street_address_1,
            'street_address_2': profile.default_street_address_2,
            'county': profile.default_county,
        })
    template = 'checkout/checkout.html'
    success_url = '/checkout/order_success'
    thank_you = '/checkout/thank_you'
    context = {
        'order_form': order_form,
        'success_url': success_url,
        'bag_products': bag_products,
        'thank_you': thank_you,
    }
    return render(request, template, context)


def order_success(request):
    """
    View that creates a new object with the JSON data, then redirects to the
    thankyou page.
    """
    # Take the request, decode it, split it into bag_contents and order_data
    # and use this data to create a new order
    request2 = request.body
    my_json = request2.decode('utf8').replace("'", '"')
    json_data = json.loads(my_json)
    bag_contents = json_data.get('bagContents')
    bag_contents = json.loads(bag_contents)
    order_data = json_data.get('jsonData')
    order_data = json.loads(order_data)
    # Manually fill the user_id field with the user's id
    order_data["user_id"] = request.user.id
    # Remove the csrf token from the data
    order_data.pop("csrfmiddlewaretoken", None)
    # Create a new instance of the Order model using the order_data received
    order = Order.objects.create(**order_data)
    order.save()
    # Loop through the bag_contents and save the details in OrderDetail model
    for item in bag_contents:
        product = Product.objects.get(pk=item['id'])
        order_detail = OrderDetail(order=order, product=product,
                                   quantity=item['quantity'])
        order_detail.save()
    order.update_total()
    # Create a value to check in the thank_you view
    request.session['redirected_from_order_success'] = True
    print("Original: ", request.session)
    # Send email to the provided email address
    send_templated_mail(
        template_name='order_confirmation',
        from_email=DEFAULT_FROM_EMAIL,
        recipient_list=[order.email],
        context={'name': order.first_name,
                 'order_number': order.order_number,
                 'order_total': order.order_total,
                 },
    )
    return HttpResponseRedirect(reverse('checkout:thank_you'))


def thank_you(request):
    """
    View that displays the thankyou page after processing an order.
    """
    # Redirect to the custom 404 page if trying to access the page without
    # making an order
    if request.session.get('redirected_from_order_success'):
        # Clear the bag and redirection token now that the order has been
        # created
        request.session.pop('bag', None)
        request.session['redirected_from_order_success'] = False
        print("Made it: ", request.session)
        return render(request, 'checkout/thank_you.html')
    else:
        print("Diverted it: ", request.session)
        return render(request, "404.html")

Relevant Checkout.html Javascript:


function completeOrder(){
        let url = '{{ success_url }}'

        const request= fetch(url, {
            method: 'POST',
            headers:{
                'Content-type':'application/json',
                'X-CSRFToken': csrftoken,
            },
        body:JSON.stringify({"bagContents": bagContents, "jsonData": jsonData} )
        })
    }

onApprove: (data, actions) => {
            return actions.order.capture().then(function (orderData) {
                const transaction = orderData.purchase_units[0].payments.captures[0];
                return completeOrder()})
        }

What's confusing is that the GET request for the thank_you template is made and gives a 200, it just doesn't move from the checkout page?

[24/Jan/2023 08:43:02] "POST /checkout/order_success HTTP/1.1" 302 0 Made it: <django.contrib.sessions.backends.db.SessionStore object at 0x7f75867dcb50> [24/Jan/2023 08:43:03] "GET /checkout/thank_you HTTP/1.1" 200 6287

Any help would be much appreciated!

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