opencart/opencart — pull request #1822 by mgraph (2014-09-07 15:59:39+00:00)
Title: Update pp_pro.php

```ISSUENUMBER``` : Issue number of Maestro card.

not sure where you got ```CARDISSUE``` it not even listed in DoDirectPayment fields :

https://developer.paypal.com/docs/classic/api/merchant/DoDirectPayment_API_Operation_NVP/