发送订阅消息，参数如下：一直报错argument invalid! data.character_string1.value i ？

{

    "template_id": "t313ynk7i9SFGsD12mnToIjVxP7R5xYsT8HfMIaNeCY",

    "page": "/mine-module/my-purchase/purchase-detail?orderSn=S_1671339911573798912",

    "touser": "ouo0_4yzYQEbBRRMCMmScH_pA3XM",

    "data": "{\"amount5\":{\"value\":1000},\"date8\":{\"value\":\"2019-12-03\"},\"character_string1\":{\"value\":1},\"thing11\":{\"value\":\"回收成功\"},\"phrase2\":{\"value\":\"已预约\"}}",

    "miniprogram_state": "trial",

    "lang": "zh_CN"

}

character_string1 换成纯数字，纯字母，英文数字混合，符号混合都不行