Update subscriber preferences in CRM from unsubscribe webhook

Unmatched unsubscribe webhooks leave subscriber preferences stale and can trigger unwanted campaign sends. This updates CRM flags and logs unmatched requests, stopping sends same day.

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Overview

Unsubscribe webhooks must translate into clean CRM preference states so campaigns stop reaching opted-out subscribers. This flow applies preference flags automatically and logs unmatched addresses, giving campaign managers a same-day audit trail and reducing manual work.