Not sure if im being a bit silly with this or if the API just doesnt work.

I am using crypto.com exchange API to trade crypto and it works fine for buying and selling. But when I use the endpoint to check user balances if just get a response of BAD_REQUEST

My code is below:

<?php
require_once 'crypto_api.php';

// Function to fetch balances from Crypto.com API
function fetch_balances() {
    global $api_key, $api_secret;

    $nonce = round(microtime(true) * 1000);
    $method = 'private/get-account-summary';
    $id = $nonce;
    $params = []; // No additional parameters needed for this call

    // Generate signature
    $sig = generate_signature($method, $id, $api_key, $params, $nonce, $api_secret);

    $request_params = [
        'id' => $id,
        'method' => $method,
        'api_key' => $api_key,
        'nonce' => $nonce,
        'params' => $params,
        'sig' => $sig
    ];

    $payload = json_encode($request_params);

    // Make API call
    $ch = curl_init('https://api.crypto.com/v2/private/get-account-summary');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);

    $response = curl_exec($ch);
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    if ($http_code != 200) {
        echo "HTTP Error: $http_codenResponse: $responsen";
        return null;
    }

    $result = json_decode($response, true);

    if (isset($result['error'])) {
        echo "API Error: " . $result['error']['message'] . "n";
        return null;
    }

    return $result['result']['accounts'] ?? [];
}

// Display balances in a readable format
function display_balances() {
    $balances = fetch_balances();

    if (!$balances) {
        echo "Failed to fetch balances or no balances available.n";
        return;
    }

    echo "Your Current Balances:n";
    echo "----------------------n";

    foreach ($balances as $balance) {
        $currency = $balance['currency'];
        $available = $balance['available'];
        $reserved = $balance['reserved'];

        echo "Currency: $currencyn";
        echo "Available: $availablen";
        echo "Reserved: $reservedn";
        echo "----------------------n";
    }
}

// Run the balance retrieval
display_balances();
?>

I’ve even filtered this through AI to help with a resolution and still no dice. Absolutely no idea what I could be missing here and any help would be greatly appreciated.

EDIT: I have edited to include the error message exactly as I receive it:

HTTP Error: 400 Response: {“code”:”10004″,”msg”:”BAD_REQUEST”}