curl --location --request POST 'https://api.kfim.cn/merchant_gate/balance_query' \
--data-urlencode 'business_code=' \
--data-urlencode 'mch_num=' \
--data-urlencode 'timestamp=' \
--data-urlencode 'sign='
{
"code": 0,
"msg": "string",
"data": {
"balance": 0,
"account_status": "string"
}
}