I want to display PAYPALAPI transaction ID.

[vivajj]

After finishing payment by Paypalapi, it is returned to "order-confirmation.php".
I want to display an "order number" and "transaction ID" on the page which returned(/order-confirmation.php).

The number was not displayed although the following two lines were added to Payment_return.tpl.

{l s='This your order ID is #' mod='paypalapi'} {$id_order}.

{l s='This Transaction ID is #' mod='paypalapi'} {$id_transaction}.

What is insufficient?
I need someone's help.
Thanks in advance.