The full amount of your purchase is authorized (held) on your credit card to guarantee future payments so you need to have at least that in available credit on your card. This allows us to offer our service without application forms, credit checks, interest or fees (even if you pay late). As long as your payment plan is kept up to date, these authorizations are never charged.
The authorization amount reduces with each monthly payment you make until the balance is cleared and we renew these authorizations periodically. The previous authorization is removed as soon as we receive a new one.