Why is my PHP/Curl draft order request returning blank?

[aimtechnology]

so i can make this request successfuly  using an online curl sender but when converted to php below it returns blank. can you see anything wrong here ?

$data  = array(

        'draft_order' => [

            'line_items' => [

                [

                    "title" => "Pre payment for " . $custDetails['email'] . "- Repair order #" . $custDetails['serial'],

                    "price" => "100.00",

                    "quantity" => 1,

                ]

            ],

            'customer' => null,

        ]

    );

    $url = my address

    $headers = [

        'Content-Type: application/json',

        'X-Shopify-Access-Token: my token',

    ];

    $ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, $url);

    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');

    $response = curl_exec($ch);

    if (curl_errno($ch)) {

        $error_msg = curl_error($ch);

    }

    curl_close($ch);

    if (isset($error_msg)) {

        // Handle error here

        return $error_msg;

    }

    $decodedResponse =  json_decode($response, true);

    if (isset($decodedResponse['draft_order']) && isset($decodedResponse['draft_order']['invoice_url'])) {

        return $decodedResponse['draft_order']['invoice_url']; // Return the draft order number (ID)

    } else {

        // Handle the case where the response does not contain the expected data

        return ':(';

    }

[aimtechnology · Accepted solution]

I fixed this, the customer, although null required  it set out as a null id 

'customer' => ["id" => null]

also, I think because im primarily a js developer, i wasn't thinking how to access the invoice_url correcty!!:

// Separate headers and body

    list($headers, $body) = explode("\r\n\r\n", $response, 2);

    // Decode the JSON body

    $decodedResponse = json_decode($body);

// return the url

return $decodedResponse->draft_order->invoice_url;