当用户 createsubcrition 订阅时，Stripe 似乎会计费两次

Question

问题是，如果用户订阅产品，则会产生费用，并从订阅者中扣除金额。然后将生成发票，同时再次从订户账户中扣除金额。从订户帐户中双倍付款。

后端代码：

 exports.createSubscription = function(req, res, next) {
    console.log("1");
    if (req.body.payment_method_id == undefined || req.body.payment_method_id == ''){
    console.log("2")
    console.log("Payment : -"+req.body.payment_method_id)
    Response.failure(req, res, '', 'payment_method_id is required')
}
else{
    console.log("package_name : -"+req.body.package_name)
    if (req.body.package_name == undefined || req.body.package_name == '') {
        console.log("4")
        Response.failure(req, res, '', 'package_name is required')
    }
    else{
        console.log("5")
        console.log("amount : -"+req.body.amount)
        if (req.body.amount == undefined || req.body.amount == '') {
            console.log("6")
            Response.failure(req, res, '', 'amount is required')
       
        }
        else{
          
            console.log("7")
      User.findById(req.userId,function(err, user){
          console.log("7")
          if(user){
            console.log("8")

            console.log("Inside User")
            if(user.stripe_customer_id){
                console.log("Inside User Stripe")
                stripe.paymentMethods.attach(req.body.payment_method_id, {
                    customer: user.stripe_customer_id,
                  }).then((attch) => {
                    console.log("10")
                      console.log("Attch :- "+JSON.stringify(attch))
                    stripe.customers.update(
                        user.stripe_customer_id,
                        {
                          invoice_settings: {
                            default_payment_method: req.body.payment_method_id,
                          },
                        }
                    ).then((up) => {
                        console.log("11")
                        console.log("UP :- "+JSON.stringify(up))
                        stripe.products.create({
                            name: req.body.package_name,
                          }).then((product) => {
                            console.log("12")
                            console.log("product :- "+JSON.stringify(product))
                            stripe.prices.create({
                                unit_amount: req.body.amount * 100,
                                currency: 'gbp',
                                recurring: {interval: 'month'},
                                product: product.id,
                              }).then((price) => {
                                console.log("13")
                                console.log("Price :- "+JSON.stringify(price))
                                stripe.subscriptions.create({
                                    customer: user.stripe_customer_id,
                                    items: [{ price: price.id }],
                                    expand: ['latest_invoice.payment_intent'],
                                }).then((subscription) => {
                                    
                                        console.log("14")
                                       
                                        Response.success(req, res, subscription, 'Subscription created.')
                                        console.log("done")
                                }).catch((error) => {
                                        console.log("15")
                                        Response.failure(req, res, {}, error.raw.message)
                                    });
                                }).catch((error) => {
                                    console.log("16")
                                    Response.failure(req, res, {}, error.raw.message)
                                });
                              }).catch((error) => {
                                console.log("15")
                                Response.failure(req, res, {}, error.raw.message)
                            });
                          }).catch((error) => {
                            console.log("15")
                            Response.failure(req, res, {}, error.raw.message)
                        });
                    }).catch((error) => {
                        console.log("17")
                        Response.failure(req, res, {}, error.raw.message)
                    });
                  }
            }
          })  
      }
    }
  }
}

有人可以建议我如何修复它吗？

Answer 1

一些事情：

1. 您共享的代码为客户创建单个订阅。订阅将包含包含 PaymentIntent 的发票。所以这应该只向客户收取一次费用。
2. 您的代码不遵循本指南中提到的 Stripe 推荐流程。
使用
3. req.body.amount * 100

   非常危险。这意味着恶意用户可以改变他们支付的价格。

而且你的代码很难阅读所有嵌套的
4. .then()

   。

这是我建议做的事情：

// Create the Customer
const customer = await stripe.customers.create({
  name: 'Foo Bar',
  email: '[email protected]',
});

// Then create the Subscription for that customer
const subscription = await stripe.subscriptions.create({
  customer: customer.id,
  items: [{ price: "price_xxx" }],
  payment_behavior: 'default_incomplete',
  payment_settings: { save_default_payment_method: 'on_subscription' },
  expand: ['latest_invoice.payment_intent'],
});

// Finally send the client secret on the frontend to collect a PaymentMethod 
res.send({
  clientSecret: subscription.latest_invoice.payment_intent.client_secret,
});