When I verify my microdata setup I get the following error:
A required field is missing: id
J'ai le même problème ..
Quelqu'un a til une solution ?
J'ai le même problème!
I found a solution that works for me. It seems that what Facebook considers as an "id" fields corresponds to what is displayed as "SKU" in Shopify. As such, I added a value to the "SKU" field of my products, and it fixed the issue.
Hope this helps other people.