The VOD Purchase PIN and the Parental Control Ratings PIN are the same. Until you change it, the PIN is 0000.
To change your Purchase/Ratings PIN:
Select the MENU button on your remote control. Within the Parental menu, arrow to the right and select the Change PIN category (For the Ratings PIN or Purchase PIN).
Use the arrow button to highlight change PIN and press the OK button.
Enter the Old PIN, arrow down and enter your New PIN. Then arrow down to confirm the New PIN. Select OK to save your new PIN. Until you change it, the default PIN is 0000.
Once the PIN has been successfully changed, a prompt will appear. Press the OK button.