membuat script withdrawal menggunakan PHP

Assalamu'alaikum wr. wb.

saya pemula, ingin membuat script withdrawal asset dari indodax ke wallet tertentu. contoh scriptnya sudah tersedia di dokumentasi API indodax

https://github.com/btcid/indodax-official-api-docs/blob/master/example/Private-RestAPI-php.md#withdraw-coin

saya sudah menyalin scriptnya dan menambahkan api key dan secret key yang diberikan indodax api.

berikut penampakan code phpnya:

<?php
    $url = 'https://indodax.com/tapi';
    // Please find Key from trade API Indodax exchange
    $key = '****';
    // Please find Secret Key from trade API Indodax exchange
    $secretKey = '****';

	$data = [
        'method' => 'withdrawCoin',
        'timestamp' => '1578304294000',
        'recvWindow' => '1578303937000',
        'currency' => 'doge',
        'withdraw_address' => 'D9iCdBLBosJzGSvpQGMSobwtdgB2rS1zam',
        'withdraw_amount' => '10',
        'withdraw_memo' => 'memo',
        'request_id' => 'trx002'
    ];
	$post_data = http_build_query($data, '', '&');
    $sign = hash_hmac('sha512', $post_data, $secretKey);

    $headers = ['Key:'.$key,'Sign:'.$sign];

    $curl = curl_init();

    curl_setopt_array($curl, array(
        CURLOPT_HTTPHEADER => $headers,
        CURLOPT_URL => $url,
        CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => $data,
        CURLOPT_RETURNTRANSFER => true
    ));

    $response = curl_exec($curl);

    curl_close($curl);
    echo $response;

setelah saya eksekusi muncul error

"{"success":0,"error":"did not pass callback check","request_error":"","callback_response":"error code: 1020"} "

dokumentasi withdraw coin disini:

https://github.com/btcid/indodax-official-api-docs/blob/master/Private-RestAPI.md#withdraw-coin-endpoints

contoh script disini:

https://github.com/btcid/indodax-official-api-docs/blob/master/example/Private-RestAPI-php.md#withdraw-coin

mohon dibantu, error macam apa itu? bagaimana cara memperbaikinya.

Terima kasih