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docs/settlement/as4/INCIDENT_RESPONSE.md

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+# AS4 Settlement Incident Response Procedures
+
+**Date**: 2026-01-19  
+**Version**: 1.0.0
+
+---
+
+## 1. Incident Classification
+
+### 1.1 Severity Levels
+
+- **CRITICAL**: Service outage, data breach, security incident
+- **HIGH**: Partial service degradation, performance issues
+- **MEDIUM**: Non-critical errors, minor performance impact
+- **LOW**: Informational issues, minor bugs
+
+### 1.2 Response Times
+
+- **CRITICAL**: 15 minutes
+- **HIGH**: 1 hour
+- **MEDIUM**: 4 hours
+- **LOW**: Next business day
+
+---
+
+## 2. Incident Response Process
+
+### 2.1 Detection
+
+1. Monitor alerts and logs
+2. Receive incident report
+3. Classify severity
+4. Assign incident owner
+
+### 2.2 Response
+
+1. Acknowledge incident
+2. Assess impact
+3. Notify stakeholders
+4. Begin investigation
+
+### 2.3 Resolution
+
+1. Identify root cause
+2. Implement fix
+3. Verify resolution
+4. Document incident
+
+### 2.4 Post-Incident
+
+1. Post-mortem meeting
+2. Incident report
+3. Action items
+4. Process improvements
+
+---
+
+## 3. Common Incidents
+
+### 3.1 Service Outage
+
+**Symptoms**: All requests failing, service unavailable
+
+**Response**:
+1. Check infrastructure health
+2. Verify database connectivity
+3. Check application logs
+4. Restart services if needed
+5. Escalate if unresolved
+
+### 3.2 Message Processing Failure
+
+**Symptoms**: Specific instructions failing
+
+**Response**:
+1. Identify failed instruction
+2. Check error logs
+3. Verify member status
+4. Retry if appropriate
+5. Manual intervention if needed
+
+### 3.3 Certificate Issues
+
+**Symptoms**: TLS handshake failures, signature validation failures
+
+**Response**:
+1. Verify certificate validity
+2. Check certificate expiration
+3. Update Member Directory if needed
+4. Notify affected members
+
+---
+
+## 4. Escalation
+
+### 4.1 Escalation Path
+
+1. On-call engineer
+2. Engineering lead
+3. CTO
+4. Executive team
+
+### 4.2 Escalation Triggers
+
+- CRITICAL incidents unresolved after 1 hour
+- Security incidents
+- Data breaches
+- Regulatory issues
+
+---
+
+## 5. Communication
+
+### 5.1 Internal Communication
+
+- Slack channel: #as4-incidents
+- Email: as4-incidents@dbis.org
+- PagerDuty: For critical incidents
+
+### 5.2 External Communication
+
+- Member notifications via email
+- Status page updates
+- Public communication if required
+
+---
+
+**End of Document**