AA Data insertion API - stitching API hit into respective AA session
I'm trying to bring in the back end orders post user created a cart(scenario - B2B provision to checkout cart form their in-house system)
Ref to this post - https://developer.adobe.com/analytics-apis/docs/1.4/guides/data-insertion/
I was hoping to passECID to <marketingCloudVisitorId> when my backend system places an order. In this case data stitching would happen as same ECID from the user session was passed. Unfortunately, they came back stating MCMID can't be fetched from the user UI(front end session cookie) for some reasons
As an alternate my backend team willing to pass the cartID from the same user session.
But my question here is if cartId to <visitorId> field, HOW can we make adobe consider/stitch this API inserted hit into a session matching cartId? Thanks