Contracts and Integrations Best Practices

Overview

Contract-driven integration improves reliability between services, teams, and external systems.

Contract Practices

• Define schemas explicitly
• Version contracts with compatibility rules
• Use contract tests in CI
• Document errors and edge cases

sequenceDiagram
    participant Consumer
    participant Contract
    participant Provider
    Consumer->>Contract: Validate expectations
    Provider->>Contract: Validate implementation
    Contract-->>Consumer: Pass or fail

Practical Example

A provider publishes OpenAPI schemas and consumers run compatibility tests on pull requests.

Production Example

Platform teams often enforce backward compatibility checks to avoid breaking mobile or partner clients.

Common Pitfalls

• Informal contracts communicated only in chat
• Breaking field changes without versioning
• No ownership for contract lifecycle

Key Takeaways

• Contracts reduce integration regressions.
• Automated compatibility checks improve release safety.
• Clear ownership keeps contracts trustworthy.