• request_tag
• conversions
• purchases
• engagement_scope

The correct answer is: engagement_scope

Explanation: The engagement_scope field in the conversions_with_relevance table categorizes the relationship between the conversion event and the campaign it is relevant to.

Possible values include PROMOTED, BRAND_HALO, and null, describing whether the event was directly promoted or attributed to brand halo.

Reference content: From the official Amazon documentation – Conversions with relevance table

“engagement_scope: The engagement scope between the campaign setup and the conversion. Possible values for this column are PROMOTED, BRAND_HALO, and null. See also the definition for halo_code. The engagement_scope will always be ‘PROMOTED’ for pixel conversions…”