Donations are processed by either Network for Good or WePay. Both are PCI Level 1 (that's the best), secure credit card processing services.
Network for Good sends payments to charities via check on the 15th of each month which includes all donations made in the previous month. For example, donations processed in October will be paid on November 15th. Checks will be sent to the address that the charity has on file with GuideStar or CanadaHelps.
WePay sends funds to charities in real time. Some initial setup is required by the charity admin to initiate the first withdrawal, then all additional payments are automatic.
As a fundraiser or campaign organizer, no action is required to withdraw these funds and forward them to the charity. So easy.