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"
}