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Binance REST API - Placing a PHP Order (POST) via Query String

I am struggling using Binance's REST API. I have managed to get working GET request via query string such as pinging the server, ticker information, etc. My challenge now is performing POST request via query string using cURL. I have been scraping code from various places and referring back to the API to get pieces to work but I am unsure as to why I am getting this error returned from the result:

{"code":-1102,"msg":"Mandatory parameter 'signature' was not sent, was empty/null, or malformed."}

ERROR SHOWN ON WEBPAGE

I echo out the signature and its a load of gibberish so I would believe that the hash_hmac performed at the top would be working, but honestly I got pretty lucky making the GET request work. Does anyone have any suggestions as to why this would be broken?

$apikey = "MYKEY";
$apisecret = "MYSECRET";

$timestamp = time()*1000; //get current timestamp in milliseconds
$signature = hash_hmac('sha256', "TRXBTC&type=market&side=buy&quantity=100.00&recvWindow=10000000000000000&timestamp=".$timestamp, $apisecret);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://www.binance.com/api/v3/order/test");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_HEADER, FALSE);
curl_setopt($ch, CURLOPT_POST, TRUE);
curl_setopt($ch, CURLOPT_POSTFIELDS, "symbol=TRXBTC&type=market&side=buy&quantity=100.00&recvWindow=10000000000000000&timestamp=".$timestamp);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/x-www-form-urlencoded","X-MBX-APIKEY: ".$apikey,"signature: ".$signature));
$response = curl_exec($ch);
curl_close($ch);

echo $response;
Solution

  • As per their API docs:

    SIGNED endpoints require an additional parameter, signature, to be sent in the query string or request body.

    You are sending the signature via neither of these methods and are instead sending it through the header.

    Change this:

    curl_setopt($ch, CURLOPT_POSTFIELDS, "symbol=TRXBTC&type=market&side=buy&quantity=100.00&recvWindow=10000000000000000&timestamp=".$timestamp);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/x-www-form-urlencoded","X-MBX-APIKEY: ".$apikey,"signature: ".$signature));

    To this:

    curl_setopt($ch, CURLOPT_POSTFIELDS, "symbol=TRXBTC&type=market&side=buy&quantity=100.00&recvWindow=10000000000000000&timestamp=" . $timestamp . "&signature=" . $signature);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/x-www-form-urlencoded","X-MBX-APIKEY: ".$apikey));