What's this about full authorizations?

When you make your purchase, your merchant or retailer takes your first installment payment. 

At the same time, they authorize the full outstanding purchase amount as a guarantee for future payments. This authorization is not charged as long as your plan is kept up to date.

Authorisations for the full outstanding amount are renewed periodically and decrease with each installment payment made. 

The previous authorisation is automatically removed as soon as a new one is obtained.