I assumed that the cookie option wasn’t really possible. I’m just at a loss for how to make this work in context where I’m able to properly send events (mainly purchase events) with advanced matching parameters in this scenario.
If I send the purchase event when returning to the main domain from the third party checkout, then I still lose all Data Layer + Local Storage + client written cookie info. Would I need to use Firebase to catch that information then write to my main domain’s cookie from sGTM, then use that when firing the purchase event from my home domain after checkout is finished? Any other ideas?