The directional flow from Klaviyo toward Amazon is narrower in scope: the main use case is suppression list management, where unsubscribes from Klaviyo email flows are cross-referenced against Amazon customer records to ensure compliance with email opt-out signals across channels. A secondary pattern is using Klaviyo segment data — high-LTV customers, repeat purchasers — to inform Amazon Sponsored Products targeting via the Amazon Ads API, though this requires a separate Ads API connection rather than Seller Central. For most sellers, the primary value of this pair flows in the opposite direction (Amazon orders enriching Klaviyo profiles), and the klaviyo_amazon setup is a supplementary compliance and targeting workflow rather than a core operational sync.