Hi @Christiannoerbjerg!
This may be possible with a custom integration, although there is no API endpoint that specifically gathers the value of a cart as its primary function.
There may be potential workarounds, but they will likely require extensive development efforts. For example, it’s possible to pass the total value of items in a cart with the Started Checkout metric. See our developer docs here for an example of how this would appear:
So theoretically, you could gather this monetary value from the Started Checkout metric using the Get Events API endpoint:
Then, you would have to create some logic on your side to figure out the differential.
If you decide to go this route and feel that you could use some extra development help, you’re always welcome to reach out to one of our wonderful Official Klaviyo Partners.
I hope this helps!
Best,
Brian