python - Stripe 订阅在 Django/Python 上创建重复支付

Question

我使用 Django/Stripe SDK 创建了一个 stripe 订阅，因为该软件在欧洲，它使用了新的 SCA(强客户身份验证)。因此，首先我将来源附加到客户，然后我尝试订阅他们，它有效，但对于某些客户，我在 Stripe 控制面板上看到重复付款。

我已经联系了 Stripe，他们的客户支持推荐了以下内容，但我无法理解:

I see what you mean when you say the customers are being charged more than
once. The issue boils down to the API call requesting them to be added to a subscription is being sent more than once to Stripe from your server.

To solve this on your end, you will need to make sure your system is sending a request only once. I would recommend checking your server to see where the requests are coming from. It may be an easy solve on that end once this is determined.

@login_required
def PaymentView(request):
    profile = Profile.objects.filter(user=request.user).first()
    try:
        address = profile.address.get(address_type="home")
    except:
        address = None
    user_membership = get_user_membership(request)
    try:
        selected_membership = get_selected_membership(request)
    except:
        return redirect(reverse("membership:select"))
    publishKey = settings.STRIPE_PUBLISHABLE_KEY
    if request.method == "POST":
        # try:
        source = request.POST.get('stripeSource', "")
        amend = request.POST.get('amend', '')

        '''
        First we need to add the source for the customer
        '''
        if amend == "true":
            customer = stripe.Customer.modify(
                user_membership.stripe_customer_id,
                source=source,
            )
            customer.save()
        else:
            customer = stripe.Customer.retrieve(
                user_membership.stripe_customer_id)

            try:
                customer.source = source  # 4242424242424242
                customer.save()
            except:
                pass

        '''
        Now we can create the subscription using only the customer as we don't need to pass their
        credit card source anymore
        '''

        stripe_subscription = stripe.Subscription.create(
            customer=user_membership.stripe_customer_id,
            items=[
                {"plan": selected_membership.stripe_plan_id},
            ],
            # billing="charge_automatically", #billing is depricated
            collection_method="charge_automatically",
            expand=['latest_invoice.payment_intent'],
            # idempotency_key='FXZMav7BbtEui1Z3',
        )
        # subscription = djstripe.models.Subscription.sync_from_stripe_data(
        #     stripe_subscription
        # )

        if stripe_subscription.status == "active":
            return redirect(reverse('membership:update-transactions',
                                    kwargs={
                                        'subscription_id': stripe_subscription.id
                                    }))
        elif stripe_subscription.status == "incomplete":
            payment_intent = stripe_subscription.latest_invoice.payment_intent
            if payment_intent.status == "requires_action":
                messages.info(
                    request, "Your bank requires extra authentication")
                context = {
                    "client_secret": payment_intent.client_secret,
                    "STRIPE_PUBLIC_KEY": settings.STRIPE_PUBLISHABLE_KEY,
                    "subscription_id": stripe_subscription.id
                }
                return render(request, "membership/3d-secure-checkout.html", context)
            elif payment_intent.status == "requires_payment_method":
                messages.warning(
                    request, "Your card has been failed or declined, Please try again")
                context = {
                    'publishKey': publishKey,
                    'selected_membership': selected_membership,
                    'client_secret': client_secret,
                    'address': address,
                    'profile': profile,
                    'amend': "true"
                }
                return render(request, "membership/membership_payment.html", context)
            else:
                messages.info(
                    request, "Something went wrong. Please report to the website admin.")

    context = {
        'publishKey': publishKey,
        'selected_membership': selected_membership,
        # 'client_secret': client_secret,
        'address': address,
        'profile': profile,
        'amend': "false"
    }

    return render(request, "membership/membership_payment.html", context)


@login_required
def updateTransactionRecords(request, subscription_id):
    user_membership = get_user_membership(request)
    selected_membership = get_selected_membership(request)
    user_membership.membership = selected_membership
    user_membership.save()
    sub, created = Subscription.objects.get_or_create(
        user_membership=user_membership)
    sub.stripe_subscription_id = subscription_id
    sub.active = True
    email_content, e = EmailTemplate.objects.get_or_create(
        email_tag='paid_subscription_success')
    recepient = request.user.email
    sender = settings.EMAIL_HOST_USER
    send_mail(email_content.email_subject, email_content.email_body,
              sender, [recepient])
    sub.save()

    try:
        del request.session['selected_membership_type']
    except:
        pass

    messages.info(request, 'Successfully created {} membership'.format(
        selected_membership))
    return redirect(reverse('membership:select'))


@login_required
def successful_membership(request):
    selected_membership = request.session.get('selected_membership', "Free")

    return render(request, 'membership/purchase_membership_success.html', context={"membership": selected_membership})

这是我的 js 的一部分:

<script src="https://js.stripe.com/v3/"></script>
  <!-- script for the stripe form -->
  <script type="text/javascript">
  // Create a Stripe client.
    var stripe = Stripe("{{ publishKey }}");

    // Create an instance of Elements.
    var elements = stripe.elements();
    var cardButton = document.getElementById("card-button");
    var cardholderName = document.getElementById("cardholder-name");
    var cardElement = elements.create("card");
    cardElement.mount("#card-element");
    var line1 = document.getElementById("line1");
    var line2 = document.getElementById("line2");
    var city = document.getElementById("city");
    var country = document.getElementById("country");
    var postalCode = document.getElementById("postal_code");
    var email = document.getElementById("email");
    var ownerInfo = {
      owner: {
        name: cardholderName.value,
        address: {
          line1: line1.value,
          line2: line2.value,
          city: city.value,
          postal_code: postalCode.value,
          country: country.value
        },
        email: email.value
      }
    };
    // Add an instance of the card Element into the `card-element` <div>.
    // Handle real-time validation errors from the card Element.
    cardElement.addEventListener("change", function (event) {
      var displayError = document.getElementById("card-errors");
      if (event.error) {
        displayError.textContent = event.error.message;
      } else {
        displayError.textContent = "";
      }
    });
    // Handle form submission.
    var form = document.getElementById("payment-form");
    form.addEventListener("submit", function (event) {
      event.preventDefault();
      stripe.createSource(cardElement, ownerInfo).then(function (result) {
        if (result.error) {
          // Inform the user if there was an error.
          var errorElement = document.getElementById("card-errors");
          errorElement.textContent = result.error.message;
        } else {
          // Send the token to your server.
          setTimeout(stripeSourceHandler(result.source), 3000);
          //stripeSourceHandler(result.source);
        }
      });
    });
    // Submit the form with the source ID.
    function stripeSourceHandler(source) {
      var form = document.getElementById("payment-form");
      var hiddenInput = document.createElement("input");
      hiddenInput.setAttribute("type", "hidden");
      hiddenInput.setAttribute("name", "stripeSource");
      hiddenInput.setAttribute("value", source.id);
      form.appendChild(hiddenInput);
      // Insert the source ID into the form so it gets submitted to the server
      // Submit the form
      form.submit();
    }
  </script>

Answer 1

我已经通过在订阅之前检查用户是否有任何当前有效的订阅来解决这个问题，我不确定它首先发生的原因但我认为这是由于互联网速度或移动设备断开连接，所以 javascript 正在发送请求，但在它重定向用户之前，它会失去它的连接。

这是我用 stripe SDK 修复它的方法:

customer = stripe.Customer.retrieve(user_membership.stripe_customer_id)
        if customer.subscriptions.total_count > 0:
            for i in customer.subscriptions.data:
                if i.plan['id'] == selected_membership.stripe_plan_id and i.plan['active'] == True:
                    messages.info(
                        request, "Your have already subscribed to this plan")
                    return redirect(reverse('membership:update-transactions',
                                            kwargs={
                                                'subscription_id': i.id
                                            }))
                else:
                    pass  # Maybe we can check if users have a subscription that needs renewing
        else:

如果有人有更清晰的代码，请与我分享。 😊