This is what I am currently working on. We’ve decided to add a shopping cart because 1) it is commonly requested and 2) the way event items works in TT3 is not compatible with the upgrades we’ve made.
We’ve generally tried to avoid adding new features to TT4 so far because it’s such a big change, but I think this one is unavoidable and will be welcomed. Here’s a video showing the cart in action. It will also work for RSVP’ing to events as well, though it’s not shown in the video. We may eventually add the ability to create a unit commissary you can use to sell items with.
The shopping cart will allow your users to make multiple purchases (RSVP’s, event items, etc) in one transaction, which will save you on transaction fees from Stripe and PayPal.
In this video I add multiple items to my cart from two different events.