Draft changelog: Sep 26, 2026 weekly update

[mintlify]

Summary

Adds a Sep 26, 2026 changelog entry covering product changes merged since the Sep 21 entry.

Changes

• New features: X Activity API subscription expires_at, OAuth 2.0 client secret webhook signatures, is_moderator on broadcast.chat
• Updates: broadcast scopes in OAuth 1.0a token exchange, source removed from tweet.fields

Context

Sourced from merged PRs #441, #443, #445, #448, #450. Docs-only changes (livestream wording, OBS example, batch compliance limit correction) were excluded.

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Project	Status	Preview	Updated
x-corp	🟢 Ready	View Preview	Sep 26, 2026, 11:08 PM

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