微信发票插卡postman调用invalid params, fee is empty hint？

发票链接：https://developers.weixin.qq.com/doc/offiaccount/WeChat_Invoice/E_Invoice/Invoicing_Platform_API_List.html#5

{

"order\_id":"202005290000003",

"card\_id":"pMX-a1GJrPdDrYNngMtPpvb-Qz5U",

"appid":"wxf3478a2ab0f6ae09",

"card\_ext":{

	"nonce\_str":"234bgZXl",

	"user\_card":{

		"fee":5,

		"title":"123323",

		"billing\_time":1244534234,

		"billing\_no":"312312",

		"billing\_code":"213124",

		"fee\_without\_tax":1,

		"tax":1,

		"s\_pdf\_media\_id":"7281293713727554138",

		"check\_code":2312

	}

}

}