Interface Requirements

Type	Level	UID	PREFIX	REFS	Title	Statement	Rationale	Comment
TEXT						Interfaces define how the system connects to external systems, APIs, services, and user-facing endpoints. Answer: What does the system connect to? UID prefix: INTF- Traces up to: Features (FEAT-) Implemented by: API clients and adapters (# impl INTF-NNN) Verified by: Integration tests (# verify INTF-NNN)
REQUIREMENT	1	INTF-000		Parents: FEAT-000 Feature Template	INTF-000 Interface Template	The system shall integrate with [external system] to [purpose]. Direction: [inbound / outbound / bidirectional] Protocol: [REST / GraphQL / SMTP / webhook / file transfer] Authentication: [API key / OAuth / certificate] Data exchanged: [what flows in/out] Frequency: [real-time / batch / on-demand] Fallback behavior: [what happens when unavailable]