给小程序加广告监测。app ID wx2af279ce623c0a4a

curl -vvv "https://api.weixin.qq.com/marketing/user_actions/add?version=v1.0&access_token=xxx"

\

-H "Content-Type:application/json" \

-d '{

  "actions": [

    {

      "user_action_set_id": 1111520785,

      "user_id": "test123456",

      "url": "http://www.qq.com",

      "action_time": 1615429143,

      "action_type": "COMPLETE_ORDER",

      "trace": {

        "click_id": "wx0testtestzzzma00"

      },

      "action_param": {

        "value": 10180

      }

    }

  ]

}'

返回错误 {"errcode":900351002,"errmsg":"JSON string is malformed."}

把      "action_time": 1615429143,改成 　"action_time": "",　之后，依然出现一样的错误。请问是什么原因呢？