Integration & API Design Standards
APIs and integrations that survive scale, audits, partner ecosystems, and years of change.
This page defines how Clavon designs integrations and APIs that survive scale, audits, partner ecosystems, and years of change.
Most system failures are not caused by core logic.
They are caused by interfaces.
APIs and integrations are contracts, not plumbing.
Why Integration Is the Highest-Risk Layer
Across startups, enterprises, and regulated systems, integration failures typically arise from:
These failures:
- propagate silently,
- create operational fragility,
- and become exponentially expensive to fix.
Clavon treats integration as a first-class architectural discipline.
Clavon Integration Principles (Non-Negotiable)
If an integration violates these principles, it is redesigned.
Integration Taxonomy (Clavon Standard)
We classify integrations along two axes
A) Interaction Style
Synchronous
(request/response)
Asynchronous
(events, messages)
B) Responsibility Type
Commands
(intent to change state)
Queries
(read-only)
Events
(fact that something happened)
Confusion between these types is a primary source of failure.
Synchronous Integration (APIs)
When Synchronous APIs Are Appropriate
When They Become Dangerous
API Design Standards (Clavon)
API as a Product
Every API must have:
- a named owner
- documented consumers
- a versioning strategy
- lifecycle status (active, deprecated, retired)
APIs without ownership are operational liabilities.
Contract-First Design
Every API must have:
- define request/response schemas
- document error semantics
- agree on versioning rules
- define performance expectations
Contracts are reviewed like code.
Versioning Strategy (Mandatory)
Every API must have:
- URI-based or header-based (context-dependent)
- backward-compatible changes only within a version
- breaking changes require a new version
Anti-pattern:
"We'll coordinate consumers informally."
Error Handling & Semantics
Every API must have:
- use consistent status codes
- return machine-readable error structures
- separate user-facing vs internal errors
- never leak sensitive information
Errors are part of the contract, not an afterthought.
Idempotency & Safety
Every API must have:
- support idempotency where applicable
- tolerate retries
- avoid duplicate side effects
This is non-negotiable in distributed systems.
Asynchronous Integration (Events & Messaging)
When Asynchronous Is the Right Choice
Event Design Principles
Events are:
- immutable
- factual ("OrderCreated", not "CreateOrder")
- owned by the producing domain
- versioned and schema-governed
Critical rule:
Events describe what happened, not what should happen.
Common Event-Driven Failure Modes
Clavon designs events to be stable, observable, and replayable.
API vs Event Decision Framework
Hybrid models are common—but must be intentional.
Data Ownership & Integration Boundaries
Clavon Rule: A system owns its data. Other systems reference it—they do not mutate it.
Violations lead to:
- data inconsistency
- audit failures
- impossible debugging
Integrations must respect:
- system-of-record definitions
- write vs read responsibilities
- replication vs synchronization strategies
Security & Access Control for Integrations
Every integration must define:
Clavon defaults to:
- zero-trust assumptions
- least-privilege scopes
- explicit trust boundaries
- audit logging of access
Shared secrets or static credentials are prohibited.
Integration Testing & Contract Assurance
Required Test Layers
Testing integrations only through end-to-end flows is insufficient.
Observability for Integrations
Every integration must emit:
If you cannot trace a request end-to-end, you cannot operate the system reliably.
Integration Architecture Patterns
API Gateway
for north–south traffic
Internal service mesh
for east–west communication
Event backbone
for cross-domain propagation
Adapter layers
for legacy systems
Patterns are selected based on operational maturity, not preference.
Legacy & External System Integration
When integrating with ERP, CRM, or third-party platforms:
Legacy systems are treated as hostile environments—by design.
Compliance & Audit Considerations
Integration design must support:
Auditability is engineered, not documented retroactively.
Common Anti-Patterns (Actively Prevented)
Shared databases across systems
Hidden coupling through payload assumptions
Versionless APIs
Fire-and-forget integrations without monitoring
"Temporary" adapters with no retirement plan
Deliverables Clients Receive
Integration architecture blueprint
API design standards & templates
Versioning and deprecation policy
Event schema governance model
Security and access patterns
Testing and observability requirements
Integration evolution roadmap
Cross-Service Dependencies
This page directly supports related services
Enterprise Architecture & Systems Integration
ERP & CRM Integrations
Cloud & DevOps
QA & Test Automation
AI & Data Pipelines
Why This Matters
Poor integrations silently destroy:
Well-designed integrations:
Ready to Build Robust Integrations?
Let Clavon help you design integrations that survive scale, audits, and change.