Testing an online payment Form using Django Keep getting Not Authenticated Error. Is it because of the Testing Credit Card numbers?

I am making a project for an online payment e-commerce

I think I got everything right as am following a Tutorial

Keep getting this Error: Not Authenticated Error I used the testing CC Numbers for testing purposes

My question is the following codes correct and I'm getting Not Authenticated Error because they are testing Credit Card Numbers.?

class PaymentView(View):      def get(self, *args, **kwargs):          # order          return render(self.request, "payment.html")    # `source` is obtained with Stripe.js; see https://stripe.com/docs/payments/accept-a-payment-charges#web-create-token      def post(self, *args, **kwargs):          order = Order.objects.get(user=self.request.user, ordered=False)          token = self.request.POST.get('stripeToken')          amount = int(order.get_total() * 100)            try:              charge = stripe.Charge.create(                  amount=amount,  # cents                  currency="usd",                  source=token,              )              # create payment              payment = Payment()              payment.stripe_charge_id = charge['id']              payment.user = self.request.user              payment.amount = order.get_total()              payment.save()                # assign the payment to the order              order.ordered = True              order.payment = payment              order.save()                messages.success(self.request, "Your Order was Successful ! ")              return redirect("/")            except stripe.error.CardError as e:              body = e.json_body              err = body.get('error', {})              messages.error(self.request, f"{err.get('message')}")              # Since it's a decline, stripe.error.CardError will be caught              return redirect("/")            except stripe.error.RateLimitError as e:              # Too many requests made to the API too quickly              messages.error(self.request, "Rate Limit Error")              return redirect("/")            except stripe.error.InvalidRequestError as e:              # Invalid parameters were supplied to Stripe's API              messages.error(self.request, "Invalid Parameters")              return redirect("/")            except stripe.error.AuthenticationError as e:              # Authentication with Stripe's API failed              # (maybe you changed API keys recently)              messages.error(self.request, "Not Authenticated")              return redirect("/")            except stripe.error.APIConnectionError as e:              # Network communication with Stripe failed              messages.error(self.request, "Network Error")              return redirect("/")            except stripe.error.StripeError as e:              # Display a very generic error to the user, and maybe send              # yourself an email              messages.error(                  self.request, "Something went wrong. You were not charged. Please Try Again.")              return redirect("/")            except Exception as e:              # Something else happened, completely unrelated to Stripe              # send an email to ourselves              messages.error(                  self.request, "A serious Error Occured. We have been notified.")              return redirect("/")

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