curl --location --request GET 'https://sandbox-gateway.pingpongx.com/v2/fx/trade/forward/calendar?buy_currency=CNH&sell_currency=USD' \
--header 'access_token;'
{
"code": 0,
"data": [
"2023-02-01",
"2023-02-02"
],
"message": "ok"
}