Invoice.php

<?php

class Stripe_Invoice extends Stripe_ApiResource
{
  /**
   * @param array|null $params
   * @param string|null $apiKey
   *
   * @return Stripe_Invoice The created invoice.
   */
  public static function create($params=null, $apiKey=null)
  {
    $class = get_class();
    return self::_scopedCreate($class, $params, $apiKey);
  }

  /**
   * @param string $id The ID of the invoice to retrieve.
   * @param string|null $apiKey
   *
   * @return Stripe_Invoice
   */
  public static function retrieve($id, $apiKey=null)
  {
    $class = get_class();
    return self::_scopedRetrieve($class, $id, $apiKey);
  }

  /**
   * @param array|null $params
   * @param string|null $apiKey
   *
   * @return array An array of Stripe_Invoices.
   */
  public static function all($params=null, $apiKey=null)
  {
    $class = get_class();
    return self::_scopedAll($class, $params, $apiKey);
  }

  /**
   * @param array|null $params
   * @param string|null $apiKey
   *
   * @return Stripe_Invoice The upcoming invoice.
   */
  public static function upcoming($params=null, $apiKey=null)
  {
    $requestor = new Stripe_ApiRequestor($apiKey);
    $url = self::classUrl(get_class()) . '/upcoming';
    list($response, $apiKey) = $requestor->request('get', $url, $params);
    return Stripe_Util::convertToStripeObject($response, $apiKey);
  }

  /**
   * @return Stripe_Invoice The saved invoice.
   */
  public function save()
  {
    $class = get_class();
    return self::_scopedSave($class);
  }

  /**
   * @return Stripe_Invoice The paid invoice.
   */
  public function pay()
  {
    $requestor = new Stripe_ApiRequestor($this->_apiKey);
    $url = $this->instanceUrl() . '/pay';
    list($response, $apiKey) = $requestor->request('post', $url);
    $this->refreshFrom($response, $apiKey);
    return $this;
  }
}