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PHP Authentication for Coinbase Exchange Private API

I am trying to get authentication in the private Coinbase Exchange API in order to get balances and place / cancel orders. Below is a demo of the code I'm trying to use. I followed the docs, but I keep getting the following error:

{"message":"invalid signature"}

Can someone please tell me what I'm doing wrong? :)

EDIT: I changed the code below based on Sašo's answer, so it works now.

<?php
$key = "";
$secret = "";
$passphrase = "";

$time = time();
$url = "https://api.gdax.com/accounts";

$data = $time."GET"."/accounts";
echo $data . "<br/>";

$sign = base64_encode(hash_hmac("sha256", $data, base64_decode($secret), true));                
echo $sign . "<br/>";

$headers = array(                
    'CB-ACCESS-KEY: '.$key,
    'CB-ACCESS-SIGN: '.$sign,
    'CB-ACCESS-TIMESTAMP: '.$time,
    'CB-ACCESS-PASSPHRASE: '.$passphrase,
    'Content-Type: application/json'
);

var_dump($headers);

echo $url;

static $ch = null;

if (is_null($ch)) {
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36');
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);

    $res = curl_exec($ch);
    echo $res;
}
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3 answers

You do not have a true parameter for raw_output when executing hash_hmac

http://php.net/manual/en/function.hash-hmac.php

raw_output: TRUE, . FALSE .

+2

- . , . , .

0

Sasho Mateyeyna is right. you should probably be better off using the user server user agent.

$userAgent=$_SERVER['HTTP_USER_AGENT'];
curl_setopt($ch, CURLOPT_USERAGENT, $userAgent);
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