Typically, banks will set aside recent charges to your credit or debit card as a hold or pending authorization.
Multiple pending charges, authorizations, or holds on your credit or debit card may appear if your Zipcar booking is modified. For example, extensions to your trip, purchases of additional insurance products, and other changes may result in additional holds or authorizations on your card.
Once the funds have been fully transferred from your bank, the pending charges or holds will be removed. This process can take up to 3 - 5 business days, but will vary by banking institution.