Meta's V25 Graph API and Marketing API update brings significant changes for ad operations. The new Page Viewer Metric, arriving by June 2026, replaces legacy reach metrics across page and story insights, aiming for consistent cross-platform measurement. Developers should migrate from usage of `page_impressions_unique*` and similar endpoints to `page_total_media_view_unique` and `post_total_media_view_unique`.
Webhooks mTLS certificates will be signed by Meta's own CA starting March 31, 2026; failure to update trust stores with the new root CA (`meta-outbound-api-ca-2025-12.pem`) will cause TLS handshake failures. Enhanced error messaging for Ads Insights Async API begins Feb 18, 2026, adding fields like `error_code`, `error_message`, `error_subcode`, `error_user_title`, and `error_user_msg` to failed report runs, with `error_code` changing from uint to int. The `metadata=1` query parameter is deprecated from v25 and will be removed in May 2026.
Deprecations of reach/impression and 3-second viewer metrics are scheduled for June 2026, pushing adoption of Media Views and Media Viewers. For paid/organic breakdowns, `page_media_view` and `post_media_view` are recommended. Marketing API sees deprecation of ASC and AAC campaigns: creation/update stops Feb 18, 2026, and all such campaigns will be paused by Sep 2026.
ECBC (Existing Customer Budget Caps) campaigns remain editable until v26.0, with options for manual duplication, API replication, or bulk migration. Finally, Graph API versions v19 and v20 are deprecated on May 21, 2026 and Sep 24, 2026 respectively, urging migration to the latest version. Key action items: update webhook trust stores by March 31, 2026; migrate from legacy metrics to Media Views/Viewers by June 2026; prepare for ASC/AAC deprecation by moving to Advantage+; and plan for version upgrades.
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