VALIDATION_ERROR：“请求中的字段无效”

Question

我正在尝试使用paypal rest api创建协议。

  

POST https://api.sandbox.paypal.com/v1/payments/billing-agreements

在请求正文中，我按照文档传递“agreement_details”和其他必填字段，如姓名，描述等。

https://developer.paypal.com/docs/api/payments.billing-agreements#agreement_create

"agreement_details": {
    "outstanding_balance": {
      "value": "0.00"
    },
    "cycles_remaining": "4",
    "cycles_completed": "0",
    "final_payment_date": "2016-12-22T20:53:43Z",
    "failed_payment_count": "0"
  }

  

状态：400错误请求

{
  "name": "VALIDATION_ERROR",
  "details": [
    {
      "field": "agreement_details",
      "issue": "Field is invalid in a request."
    }
  ],
  "message": "Invalid request. See details.",
  "information_link": "https://developer.paypal.com/webapps/developer/docs/api/#VALIDATION_ERROR",
  "debug_id": "2fcb57fb9581f"
}