If there is an issue with your pre-authorisation (a hold on the funds in your nominated account) you will be notified via text message. The pre-authorisation will be attempted daily, for up to 4 attempts until it is successful. At any time, you can update your card details via your Athlete Profile – Update Card Details section. If your payment does not go through by the last attempt then your training session will be cancelled. Here is a video on how to update your card details: https://www.youtube.com/watch?v=9GUCogIMJIc If your session cancels and you want to rebook (with a new card or updated card details) just make a new booking and the payment process will recommence.