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keyword index from the snapshot taken on March 1st versus the one from March 15th — what shifted between those two dates?"}],"resultDescription":"A JSON object containing the diff between two literal keyword index snapshots for the specified marketing campaign, including added keywords, removed keywords, and any modified entries, along with metadata about both snapshots such as timestamps and campaign identifiers.","failureModes":["Missing or invalid campaign identifier returns an error","One or both snapshot references not found results in a not-found error","Malformed request body returns a validation error","Snapshots from different campaigns cannot be compared and return a mismatch error","Payment failure via x402 prevents endpoint access"],"whenToPreferThis":"Use this endpoint when you need to programmatically detect and audit changes in a marketing campaign's literal keyword index between two points in time, especially for compliance, QA, or drift-monitoring workflows where exact 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