Most API problems are not “code” problems—they’re contract problems. A few upfront decisions make integrations faster, support easier, and future changes less painful.
If you want help implementing: API Development and Integrations.
1) Design around resources and outcomes
Prefer clear nouns for resources:
GET /customers/{id}POST /subscriptions
Avoid leaking internal architecture through endpoints. Model what clients need to do, not how you do it internally.
2) Make errors predictable
Return consistent error shapes with:
- A stable error code (machine readable)
- A human message
- Optional metadata (field name, limits, etc.)
3) Version with intent
The easiest way to “version” is to avoid breaking changes. When you must:
- Use a clear strategy (path versioning, header versioning, etc.)
- Document timelines and deprecation
4) Treat auth and rate limits as part of the product
Good APIs protect customers and your infrastructure:
- Explicit scopes/permissions
- Rate limiting per key/customer
- Audit logging for sensitive actions
5) Document the contract (and keep it current)
OpenAPI specs help you:
- Generate SDKs
- Validate requests
- Keep docs and code aligned
If integrations are a core channel, invest in docs early—it pays back quickly.
Next read: Integrations that scale.