An email sent to the customer when a new order is paid for.
Author: WooThemes
Inheritance: extends WC_Email
 public function init_form_fields()
 {
     parent::init_form_fields();
     unset($this->form_fields['subject']);
 }
 /**
  * get_heading function.
  *
  * @access public
  * @return string
  */
 function get_heading()
 {
     return apply_filters('woocommerce_email_heading_customer_renewal_order', parent::get_heading(), $this->object);
 }