Passing Shopify's in Pixel variable

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I'm trying to pass shopify's in my tracking pixel. Here is the variable: category: "{{ }}". But no value is passing back to my tracking platform. I understand the token I'm using is a Shopify approved token.

The client has products associated to multiple's. Could the reason that the value is coming back blank be, because there are multiple's associated to a product purchased and Shopify doesn't know which to pass?

Thanks for any advice.