Configurable online cancellation flow

🔍 Problem Statement

The online cancellation flow is fixed — subscribers see a standard cancellation form with no ability for publishers to customise messaging, add retention offers, or collect cancellation reasons via custom questions. This limits publishers' ability to reduce churn.

💡 User Story

As a publisher, I want to configure the online cancellation flow (custom messaging, retention offers, cancellation reason collection), so that I can reduce churn and gather actionable feedback from departing subscribers.

🎯 Definition of Done (DoD)

A feature is done when:

✔️ Given the cancellation flow configuration, when an admin customises the messaging, retention offers, and reason-collection fields, then subscribers see the configured experience during cancellation — and collected data is available in the dashboard and via API.