微信支付请求失败,响应码 = 400,返回结果 = {"code":"PARAM_ERROR","detail":{"location":"body","value":{"currency":"CNY","refund":40,"total":40}},"message":"无法将 JSON 输入源“/body/amount”映射到目标字段“回退金额”中，此字段需要一个合法的 64 位无符号整数"} 请求参数 "amount":{"total":40,"currency":"CNY","refund":40}