The quickest, easiest and most secure way to update your billing information, is by logging in to your Photofy account at http://portal.photofy.com
In the sidebar:
-Click on Photofy Pro
-Click on Billing
Go to the main part of the screen and click on the active subscription. That will take you to your subscription details.
In the top right, click on Actions, then choose Change Payment. Update your new billing information and save!
Here is a video tutorial of how to take care of this: Managing your Photofy Pro Subscription