Originally Posted by
stut
Once you have the card, you can register it on the TfL website, and then link it to a credit card. Then you can top up online, or set to auto top-up. The only proviso is that you have to set a Tube station that will serve to activate the payment on your card when you touch in at the barriers.
The auto top up will work at any station regardless of what you set. However when funds have been released to the card the first scan will get you a red light on the barrier. Tap the card again and it goes green fine. This can cause some irritation in the rush hour!