The V25 update introduces the Page Viewer Metric to replace legacy reach metrics for consistent cross-platform measurement.
Developers must migrate to viewers by June 2026.
Webhooks mTLS certificates will be signed by a new Meta-owned CA from March 31, 2026; servers must trust the new root certificate to avoid failures.
Enhanced error messaging for Ads Insights Async API adds new fields like error_code, error_message, error_subcode, error_user_title, and error_user_msg.
The metadata=1 query parameter is deprecated from V25 and will be removed in May 2026.
Multiple page/post reach, impression metrics, and 3-second viewers metrics are deprecated effective June 2026, replaced by media view metrics.
ASC and AAC campaigns cannot be created or updated via Marketing API from V25 (Feb 18, 2026) and will be paused in V26 (Sept 2026); existing Customer Budget Cap campaigns require manual duplication or API replication.
API versions v19 and v20 will be deprecated in May and September 2026 respectively.
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