Example 1: As a query string

queryString: symbol=LTCBTC&side=BUY&type=LIMIT&timeInForce=GTC&quantity=1&price=0.1&recvWindow=5000&timestamp=1499827319559

HMAC SHA256 signature:

[linux]$ echo -n "symbol=LTCBTC&side=BUY&type=LIMIT&timeInForce=GTC&quantity=1&price=0.1&recvWindow=5000&timestamp=1499827319559" | openssl dgst -sha256 -hmac "NhqPtmdSJYdKjVHjA7PZj4Mge3R5YNiP1e3UZjInClVN65XAbvqqM6A7H5fATj0j"
(stdin)= c8db56825ae71d6d79447849e617115f4a920fa2acdcab2b053c4b2838bd6b71

और फिर, जब आप एक querystring के लिए साइन अप करते हैं, तो आप उस querystring के लिए साइन अप करते हैं, और आप उस querystring के लिए साइन अप करते हैं।
मैंने कोशिश की
var querystr = "asset=abc&amount=100&address=abc&timestamp=abc";
var sig = HMAC (('sha256', 'hex', querystr, secretkey);// दूसरा पैरामीटर सभी कोशिश की
exchange.IO (("api", "POST", "/wapi/v3/withdraw.html", querystr+"&signature="+sig); या
exchange.IO("api", "POST", "/wapi/v3/withdraw.html",querystr);
मिल गया
{"msg":"{"code":-1105,"msg":"Parameter 'payload' was was empty."}","success":false}

exchange.IO("api", "POST", "/wapi/v3/withdraw.html?"+querystr+"&signature="+sig,"");//ru
मिल जाएगा
{"msg":"{"code":-1100,"msg":"Illegal characters found in parameter 'signature'; legal range is '^[A-Fa-f0-9]{64}$'."}","success":false}

अगर आपके पास signature नहीं है
{"msg":"{"code":-1022,"msg":"Signature for this request is not valid."}","success":false}