Api Paypal内部服务器错误Rest批准付款

我在使用RESTAPI创建批准付款时遇到问题。 我正在使用pyment_method='paypal'创建付款

 while i'm sending to paypal server my json file as 

"{"transactions":[
{"amount":{"currency":"USD","total":"12","details":{}},
"description":"This is the payment transaction description."}
]
,"links":[],
"intent":"sale","payer":{
"funding_instruments":[],"payment_method":"paypal"}
}"

this is 
result: Object
debug_id: "086b180fbe2f1"
information_link: "https://developer.paypal.com/webapps/developer/docs/api/#INTERNAL_SERVICE_ERROR"
message: "An internal service error has occurred"
name: "INTERNAL_SERVICE_ERROR"

---

你包含了不应该包含的元素，却遗漏了重要的元素。如果您正在设置PayPal支付，则需要取消并返回URL：

{
    "redirect_urls":{
        "return_url":"http://<return URL here>",
        "cancel_url":"http://<cancel URL here>"
    },
    "transactions":[
        {
            "amount":{
                "currency":"USD",
                "total":"12.00"
            },
            "description":"This is the payment transaction description."
        }
    ],
    "intent":"sale",
    "payer":{
        "payment_method":"paypal"
    }
}

{
“重定向URL”：{
“返回url”：“http://”，
“取消url”：“http://”
},
“交易”：[
{
“金额”：{
“货币”：“美元”，
“总计”：“12.00”
},
“说明”：“这是付款交易说明。”
}
],
“意图”：“出售”，
“付款人”：{
“付款方式”：“贝宝”
}
}

---

有关指南，请参阅

Paypal经常返回内部服务器错误。这在沙箱模式中很常见。 最常见的方法是重试并获取execute

尝试：

---

在我的例子中，我将

内容类型

标题设置为

应用程序/json

，并获得有意义的响应：

{"name":"MALFORMED_REQUEST","message":"Incoming JSON request does not map to API request","information_link":"https://developer.paypal.com/webapps/developer/docs/api/#MALFORMED_REQUEST","debug_id":"688b8ab4b2895"}

而不是：

<ns1:XMLFault xmlns:ns1="http://cxf.apache.org/bindings/xformat"><ns1:faultstring xmlns:ns1="http://cxf.apache.org/bindings/xformat">java.lang.NullPointerException</ns1:faultstring></ns1:XMLFault>

java.lang.NullPointerException