Online Ticket Sales
Event Tickets, and other 'For Sale' items, are sold through a Purchase/Registration element on the website. They cannot be sold through the Online Catalog.
Bidder Registration can be set on, or off. If Bidder Registration is 'off', the bidder won't create a password to sign-in with in the future. In either case (registration on, or off), a bidder record is created for the purchaser.
When items are purchased through the Purchase/Registration element, the default is the credit card will be charged immediately. There is a setting to "allow pay later", this allows the purchaser to add the amount to their account and not pay it immediately.
When purchases are made online, the system will automatically send a Purchase Notifications to the Bidder. You can customize this notification in the email editor