How do I finish and track Consumable IAPs with StoreKit 2?

Hi,

I'm attempting to use StoreKit 2 and SwiftUI to add a tip jar to my iOS app. I've successfully added consumable IAPs for each of my tip sizes, and used ProductView to show these on my tip jar screen. However, I am at a loss on how to do the following things:

1. How and when do I finish the consumable IAP transaction? I see the finish() function in the documentation, but I am not sure how I can call it given that ProductView is handling the purchase for me (I have no access to a Transaction object).

2. How can I track the amount of consumable IAPs the user has purchased across all their devices? I want to show the user the amount of money they have tipped in total. I have added SKIncludeConsumableInAppPurchaseHistory to my Info.plist and set it to YES as suggested here: https://forums.developer.apple.com/forums/thread/687199

This is my first time using StoreKit 2 (until now, I was using StoreKit 1), so I would really appreciate any advice and guidance you can provide. Thanks!