Why integrations drive growth and retention
Every integration a customer sets up is another reason not to churn — their data and workflows now flow through you. A public API turns your product into a platform others build on.
A well-placed integration with a tool your customers already use can become a real acquisition channel through marketplaces and directories, and it often closes deals where "does it work with X?" is the deciding question.
- Integrations raise switching cost — connected accounts churn less
- Marketplace listings (Slack, HubSpot, Shopify, Zapier) put you in front of existing buyers
- A public API lets customers and partners build what you don't have time to
- Webhooks let customers react to events in your product in real time
- "Does it integrate with our stack?" is frequently the deciding factor in a purchase
Building the API right
A public API is a promise you have to keep — once customers build on it, you can't casually break it. That means versioning, authentication, rate limiting, clear docs, and predictable behavior from day one, not internal endpoints exposed and hoped for.
- REST or GraphQL with consistent, versioned, well-documented endpoints
- Authentication built for third parties: API keys and OAuth 2.0 with scoped permissions
- Rate limiting and quotas so one integration can't degrade the service for everyone
- Webhooks with signature verification, retries, and a replay mechanism
- Developer docs, a sandbox, and example code so integration is fast
- A deprecation policy so you can evolve without breaking existing users
Choosing which integrations to build
You can't integrate with everything, so sequence matters. Build the connections your customers keep asking for first, and consider an integration platform to cover the long tail without hand-building each one.
- Prioritize by what your customers actually use and request
- Build native integrations for the few tools central to your workflow
- Use Zapier, Make, or an embedded iPaaS for the long tail of one-off connections
- Prefer OAuth-based connections so customers authorize without sharing passwords
- Add monitoring so you know when a partner's API changes and breaks a connection
More on saas products
Frequently asked questions
Should we build a public API before customers ask for one?
Usually not a fully public, documented API yet — but it's wise to build your app on a clean internal API from the start, so exposing it later is a smaller step. Premature public APIs lock you into decisions before you understand how people will actually use them.
Native integration or Zapier?
Both have a place. Native integrations give the best experience for the tools at the center of your customers' workflow and are worth the build. Zapier and similar platforms cover the long tail cheaply. A common pattern is native for the top few connections and Zapier for everything else.
How much does an API or integration cost to build?
The drivers are how many endpoints and integrations you need, whether you require OAuth and a developer portal, and your reliability requirements. A single integration is modest; a full public API program with docs and a sandbox is a larger effort. We scope it against your priorities in a free consultation.