Configure Recurly dunning campaigns and intelligent retries for failed subscription renewals

Steps

1. Create dunning campaigns in the Recurly dashboard under Configuration > Dunning; each campaign defines a retry schedule (intervals, maximum attempts) and email notification steps
2. Assign a dunning campaign to a specific plan via the plan's dunning_campaign_id field so different subscriber segments get different dunning treatment
3. Enable Intelligent Retries in the dashboard under Configuration > Recurly Recover; this ML-based system analyzes payment patterns to time retries optimally for soft declines
4. Register a webhook for new_dunning_event notification; the payload includes invoice UUID, attempt_number, next_attempt_at, and dunning_campaign_id
5. Register webhooks for invoice/closed (successful collection) and subscription/expired (dunning exhausted) to trigger downstream actions
6. For communication errors, Intelligent Retries will attempt up to 2 retries 4 hours apart, then 6 retries 1 day apart, then retries 3 days apart through end of dunning cycle — total attempts do not exceed 20 over 60 days