# CTR-001: User Authentication Service Contract

## Purpose

This contract defines the service level agreement for the User Authentication Service. The service must provide secure authentication capabilities with guaranteed uptime and response times.

## Parties

- **Service Provider**: Platform Infrastructure Team
- **Service Consumer**: All application teams requiring authentication

## Terms

1. **Availability**: 99.9% uptime during business hours (8am-8pm UTC)
2. **Response Time**: 95th percentile under 100ms
3. **Security**: All credentials encrypted at rest and in transit
4. **Audit**: All authentication attempts logged for 90 days

See architectural decision [ADR-001](ADR-001) for technology choices.

## Support

Contact: platform-team@example.com
