如何仅将API用于收费卡上的Pinpay付款？

Question

这是我的示例代码，但是我收到一条响应，指出“缺少一个或多个参数或这些参数无效”。我在pinpayments API的实现中有问题吗？

    $post = array();
    $post['email'] = 'chi@gmail.com';
    $post['amount'] = 10.00;
    $post['description'] = 'website payment';
    $post['ip_address'] = $_SERVER['REMOTE_ADDR'];
    $post['customer_token]'] = 'cus_n8k1YbNqgf1Kk4IlKWNN_g';

    // Create a curl handle
    $ch = curl_init($url);

    curl_setopt($ch, CURLOPT_USERPWD, $private_api_key); //authenticate
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); //make sure it returns a response
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // allow https verification if true
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); // allow https verification if true
    curl_setopt($ch, CURLOPT_POST, 1); //tell it we are posting
    curl_setopt($ch, CURLOPT_POSTFIELDS, $post); //tell it what to post
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Accept: application/json')); //response comes back as json

    // Execute
    $response = curl_exec($ch);

    // Check if any error occurred
    if(!curl_errno($ch)){$info = curl_getinfo($ch);}

    // Close handle
    curl_close($ch);

    //Decode JSON
    $response = json_decode($response, true);

    //Success? 
    if(!empty($response['response']['success']) && $response['response']['success'] == 1)
    {
        echo 'Successufully sent';
    }
    else
    {
        echo 'Error: ' . $response['error_description'];
    }