Security Considerations VPN Tunnels: Secure VPN tunnels (Tailscale) for server-to-server communication. Exponential Backoff: Retry connections with exponential backoff, up to a specified number of attempts. Reversal Mechanism: Failed transactions moved to a reversal account for dedicated processing. Audit Logs: All transactions and key management operations logged for auditing. Encryption: Sensitive data encrypted in transit and at rest. Authentication and Authorization: Robust mechanisms to control API access. Rate Limiting and Throttling Policy: Maximum 100 requests per minute per user. Requests exceeding the limit receive a 429 Too Many Requests response. Response for Exceeded Rate Limit: { "status": "error", "code": "rate_limit_exceeded", "message": "Too Many Requests", "details": "You have exceeded the rate limit. Please try again later.", "retry_after": "60", "uuid": "uuid_001", "signed_uuid": "signed_uuid_001" }