Kevin

the issue is that your items array doesn't have the item_id field, which GA4 requires BTW. That's what is supposed to get mapped to 'id' in the contents array by...

In my own fork, I'm planning on mapping `x-fb-cd-custom-param_name` to `event_model.param_name` to match the existing naming conventions such as `x-fb-cd-content_category` mapping to `event_model.content_category`. I'll push a PR for it soon.