golang对接paypal支付

1.申请paypal支付账号

地址 https://developer.paypal.com/developer/applications/

1.点击进入 account,创建沙箱账号（选择最下面Create custom account 可以自定义邮箱，国家选择china）

2.创建app绑定沙箱邮箱,获取 clientID和secretID (沙箱的app name 和 正式名字最好设置不一样,设置一样有点奇怪的问题)

2.直接上代码创建订单，订单检测

创建订单
开源地址 github.com/plutov/paypal
官方接口地址

func CreateOrderPayer(amount, orderID, user_idStr, queryPar string) (error, *paypal.Order) {

	c, err := paypal.NewClient(viper.GetString("paypal.clientID"), viper.GetString("paypal.secretID"), GetPaypalUrl())
	if err != nil {
		return err, nil
	}
	_, err = c.GetAccessToken(context.TODO())
	if err != nil {
		return err, nil
	}

	purchaseUnits := make([]paypal.PurchaseUnitRequest, 1)
	amount = "100"
	purchaseUnits[0] = paypal.PurchaseUnitRequest{
		Amount: &paypal.PurchaseUnitAmount{
			Currency: "USD",  //收款类型
			Value:    amount, //收款数量
		},

		InvoiceID:   orderID,
		ReferenceID: user_idStr,
		Description: "优币充值",
	}
	payer := &paypal.CreateOrderPayer{
		Name: &paypal.CreateOrderPayerName{
			GivenName: user_idStr,
			Surname:   user_idStr,
		},
	}
	appContext := &paypal.ApplicationContext{
		ReturnURL: viper.GetString("paypal.ReturnURL") + queryPar, //回调链接
		CancelURL: viper.GetString("paypal.CancelURL"),            // 失败链接
	}

	order, err := c.CreateOrder(context.TODO(), paypal.OrderIntentCapture, purchaseUnits, payer, appContext)
	if err != nil {
		return err, nil
	}
	return nil, order
	//(*order).Links[1].Href就是支付的链接
}

直接跳转到 (*order).Links[1].Href就是支付的链接，支付完成会自动跳转到 viper.GetString("paypal.ReturnURL") + queryPar 跳转回来是会带token字段，此时验签token

//回调(可以利用上面的回调链接实现) orderId 就是返回的token
func PaypalCallback(orderId string) error {
	c, err := paypal.NewClient(viper.GetString("paypal.clientID"), viper.GetString("paypal.secretID"), GetPaypalUrl())
	if err != nil {
		return err
	}
	_, err = c.GetAccessToken(context.TODO())
	if err != nil {
		return err
	}
	//log.Info(accessToken.Token,orderId)
	ctor := paypal.CaptureOrderRequest{}

	order, err := c.CaptureOrder(context.TODO(), orderId, ctor)
	if err != nil {
		//log.Info(err,"打款失败")
		return err
	}
	//查看回调完成后订单状态是否支付完成。
	strByte, _ := json.Marshal(order)
	glg.Info(string(strByte))
	if (*order).Status != "COMPLETED" {
		glg.Info(order.Status)
		return errors.New("pay fail")
	}

	glg.Info("支付成功", order.Status, order.Address)
	return nil
}

注意如果这里没有检测到，再根据webhook回调去监听，以防漏单

3.webhook添加 （选择 all events）

webhook回调的内容

{
    "id":"WH-8CU97567X88541458-3NP925494U141233J",
    "event_version":"1.0",
    "create_time":"2021-08-23T11:36:06.833Z",
    "resource_type":"capture",
    "resource_version":"2.0",
    "event_type":"PAYMENT.CAPTURE.COMPLETED",
    "summary":"Payment completed for $ 6.0 USD",
    "resource":{
        "id":"0W1096515Y4268252",
        "amount":{
            "currency_code":"USD",
            "value":"6.00"
        },
        "final_capture":true,
        "seller_protection":{
            "status":"ELIGIBLE",
            "dispute_categories":[
                "ITEM_NOT_RECEIVED",
                "UNAUTHORIZED_TRANSACTION"
            ]
        },
        "invoice_id":"2021082319353654860",
        "status":"PENDING",
        "status_details":{
            "reason":"PENDING_REVIEW"
        },
        "supplementary_data":{
            "related_ids":{
                "order_id":"1HN93431368009003"
            }
        },
        "create_time":"2021-08-23T11:35:50Z",
        "update_time":"2021-08-23T11:35:50Z",
        "links":[
            {
                "href":"https:\/\/api.paypal.com\/v2\/payments\/captures\/0W1096515Y4268252",
                "rel":"self",
                "method":"GET"
            },
            {
                "href":"https:\/\/api.paypal.com\/v2\/payments\/captures\/0W1096515Y4268252\/refund",
                "rel":"refund",
                "method":"POST"
            },
            {
                "href":"https:\/\/api.paypal.com\/v2\/checkout\/orders\/1HN93431368009003",
                "rel":"up",
                "method":"GET"
            }
        ]
    },
    "links":[
        {
            "href":"https:\/\/api.paypal.com\/v1\/notifications\/webhooks-events\/WH-8CU97567X88541458-3NP925494U141233J",
            "rel":"self",
            "method":"GET"
        },
        {
            "href":"https:\/\/api.paypal.com\/v1\/notifications\/webhooks-events\/WH-8CU97567X88541458-3NP925494U141233J\/resend",
            "rel":"resend",
            "method":"POST"
        }
    ]
}

“status”:“COMPLETED 或者 PENDING” 说明支付成功了

记录2022.1.21，目前跑了半年，没出现漏单情况
记录2022.4.1，目前跑了半年，没出现漏单情况 注意国内正式服是支付不了的

// 账号权限情况
https://www.paypal.com/restore/dashboard

// 原始开发文档
https://developer.paypal.com/api/orders/v2/#definition-order_application_context

// 沙箱登录
https://www.sandbox.paypal.com/

// 正式登录
https://www.paypal.com/mep/dashboard