/**
* Displays invoice corresponding to this basket (no checks), used in frontend and in backend.
*
* @param UserTable $user
* @param boolean $itsmyself
* @param boolean $displayButtons Displays the PRINT and CLOSE buttons
* @return string
*/
public function displayInvoice( &$user, $itsmyself, $displayButtons = true ) {
$extraStrings = $this->getInvoiceExtraStrings();
$subscriptionsGUI = new cbpaidControllerUI();
return $subscriptionsGUI->showInvoice( $this, $user, $itsmyself, $extraStrings, $displayButtons );
}
