Shopify Post-Purchase Upsell Tracking

I'd like to request support for tracking Shopify post-purchase upsells, specifically upsells processed by apps such as Kaching Upsell.

Currently, WeTracked correctly tracks the initial Shopify Purchase event, but additional revenue generated through a post-purchase upsell is not attributed back to the customer/ad because the upsell is handled separately from the original Shopify checkout.

Current situation

Example:

• Customer purchases the main product for €70

• WeTracked sends a Purchase event for €70 to Meta

• Customer accepts a €30 Kaching post-purchase upsell

• Actual customer/order value becomes €100

• Meta/WeTracked still sees only €70

This means Meta does not receive the full revenue generated by that customer/ad.

For stores using post-purchase upsells, a meaningful percentage of revenue can come from these offers. When that revenue isn't sent back to Meta, the reported ROAS and purchase values are lower than the actual performance of the campaigns.

It can also reduce the amount of value data Meta receives for optimization, especially for stores where AOV optimization through upsells is an important part of the funnel.

Support for Kaching Upsell would be particularly useful for me, but ideally this could work more generally with Shopify post-purchase upsell apps.