/**
* Default interface for payment methods.
- *
+ *
* @author Marcel Werk
* @copyright 2001-2014 WoltLab GmbH
* @license GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
* Returns the HTML code of the purchase button.
*
* @param float $cost
- * @param string $currency ISO 4217 code
+ * @param string $currency ISO 4217 code
* @param string $name product/item name
* @param string $token custom token
* @param string $returnURL
* @param string $cancelReturnURL
- * @param boolean $isRecurring
+ * @param boolean $isRecurring
* @param integer $subscriptionLength
* @param string $subscriptionLengthUnit
*