How to check Coinbase Commerce api(bitcoin) payment is complete or not?

Question

I want to accept bitcoin payment using coinbase commerce API(https://commerce.coinbase.com/docs/api/)

I was created a payment address using curl as below.

$curl = curl_init();
$postFilds=array(
    'name' => 'Test Name',
    'description' => 'Testing for checkout api',
    'pricing_type' => 'fixed_price',
    'local_price' => [
        'amount' => '100.00',
        'currency' => 'USD'
    ],
    'requested_info' => ['Test', 'test@gmail.com'],
    'metadata' => ['userId'=>10]
);
$postFilds=urldecode(http_build_query($postFilds));
curl_setopt_array($curl, 
    array(
        CURLOPT_URL => "https://api.commerce.coinbase.com/charges",
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_ENCODING => "",
            CURLOPT_MAXREDIRS => 10,
            CURLOPT_TIMEOUT => 30,
            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
            CURLOPT_CUSTOMREQUEST => "POST",
            CURLOPT_POSTFIELDS => $postFilds,
            CURLOPT_HTTPHEADER => array(
                "X-CC-Api-Key: api_key",
                "X-CC-Version: 2018-03-22",
                "content-type: multipart/form-data"
            ),
        )
);
$response = curl_exec($curl);

now I want to check payment status is failed or successes using curl OR PHP

I don't know how to use webhook. my site is in laravel 5

Thank You!