在自定义交易组件的升级中，调用生成售后单接口https://developers.weixin.qq.com/miniprogram/dev/platform-capabilities/business-capabilities/ministore/minishopopencomponent2/API/aftersale/add_new.html返回

{

"errcode": 2747002,

    "errmsg": " 参数错误"

}

小程序app_id:wxed6fc8dcb75dc2bb

请求参数格式：{

    "out_order_id":"xxxxxxx",

    "out_aftersale_id":"xxxxxxx",

    "openid":"xxxxxxx",

    "type":1,

    "product_info":{   

        "out_product_id":"xxxxxxxx",

        "out_sku_id":"xxxxxxxx",

        "product_cnt":2

    },

    "refund_reason":"666656",

    "refund_reason_type":1,

    "orderamt":2

}

请问该如何解决?