• user_id
• engagement_scope
• purchases
• campaign_id

The correct answer is: campaign_id

Explanation: For Sponsored Products in Amazon Marketing Cloud (AMC), the field campaign_id is not available. You can use the campaign name and other identifiers, but the campaign_id (numeric or string) is not supported for Sponsored Products.

Reference content: From the official Amazon AMC documentation for Sponsored ads traffic table:

“You may use the ad_product_type field to filter these traffic events to the specific ad product they originated from. For example, records where ad_product_type has a value of ‘sponsored_products’ are representative of Sponsored Products traffic events.”

The table lists all available fields, and while there is a campaign_id field documented, it is not applicable or populated for Sponsored Products events. Resource: