Hi Ashlee,
Are you using WooCommerce with Event Tickets Plus, or another ecommerce plugin? Either way, there should be a configurable setting in the ecommerce plugin to provide access to an invoice once a transaction has been made. Event Tickets Plus actually doesn’t handle the payment or contain the order information, but you should be able to create that sort of workflow through the ecommerce side of things. For example, I found this post on how to set up an order invoice using WooCommerce that you might find helpful.
Does this make sense and will it work for you? Please let me know.
Cheers!
Geoff