Create payment.php

This will help you for the version 1.5.6

 This will fix the next errors:
 Warning: Function displayHeader() is deprecated
 Warning: Function displayFooter() is deprecated
 Fatal error: Call to a member function isLogged()


Esto te será de ayuda para los errores del modulo para la version 1.5.6 de prestashop

 Arreglará los siguientes errores:
 Warning: Function displayHeader() is deprecated
 Warning: Function displayFooter() is deprecated
 Fatal error: Call to a member function isLogged()