自定义交易组件-申请售后,一直提示参数错误,求大佬指导?

https://api.weixin.qq.com/shop/ecaftersale/add?access_token=xxx
中午调试一切正常,接口也正常.组件接入正常,下午测试整个流程的时候,一直报错:{"errcode":2747002,"errmsg":" 参数错误 rid: 6242d6fa-73de7f15-5f053bdc"}
参数:
{
	"order_id": "3302243264260867328",
	"out_order_id": "257760198054391828",
	"out_aftersale_id": "AS257760745537155094",
	"openid": "obNC-5SPI5sLzjksN5FZsMYmogMA",
	"type": "2",
	"product_info": {
		"out_product_id": "1501497658772729857",
		"out_sku_id": "1501497659175383042",
		"product_cnt": 1
	},
	"refund_reason": "其他",
	"refund_reason_type": 1,
	"orderamt": 1
}

官方API接口参数:
{
    "order_id":32434234,            // 发起售后的订单ID
    "out_order_id": "xxxxx",
    "out_aftersale_id": "xxxxxx",   // 商家售后ID
    "openid": "oTVP50O53a7jgmawAmxKukNlq3XI", // 买家
    "type": 1,          // 1:退款,2:退款退货          
    "product_info":
    {
        "out_product_id": 234245,
        "out_sku_id":23424,
        "product_cnt": 5
    },
    "orderamt": 123, // 退款金额
    "refund_reason": "xxx", // 退款原因
    "refund_reason_type": 1 // 退款原因类型
    "media_list":  // 顾客举证图片
    [
        {
            "type": 1, // 1:图片,2:视频
            "url": "xxx"
        }
    ]
    ...
}

其中media_list 是选填参数.求大佬帮忙看一下