When two systems need to talk, someone must choose how. REST, GraphQL and webhooks come up in almost every integration conversation, often as if they were rivals. They are not: they solve different problems and frequently work together. REST and GraphQL are two ways of *asking* a system for data or actions; webhooks are a way for a system to *tell you* something has happened. This guide explains each in plain English, compares them honestly and shows how they combine in real projects — so you can follow the technical discussion and make good decisions.
In this article
Asking vs. being told
It helps to separate two directions. With request/response APIs (REST, GraphQL) your system asks another system a question or gives it an instruction and gets an answer. With webhooks the other system sends *your* system a message when an event occurs, such as “payment succeeded” or “order shipped”. If you are new to the basics, start with what API integration is.
| REST | GraphQL | Webhooks |
|---|---|---|
| Direction | You ask, it answers | You ask, it answers |
| Shape of data | Fixed by each endpoint | You choose the fields |
| Number of requests | Often several for related data | Often one for related data |
| Best for | Standard operations, broad compatibility | Complex front ends, mobile apps, varied data needs |
| Learning curve | Gentle | Steeper |
REST: the dependable default
A REST API exposes “resources” (customers, orders, invoices) at addresses, and you use standard web actions on them: fetch, create, update, delete. It is simple, cacheable, understood by nearly every developer and supported by almost every service you will want to connect to, from payment providers to CRMs.
Strengths
- Simple, predictable and widely supported
- Easy to test, cache and monitor
- Great tooling and documentation conventions
- Fits most business integrations
Trade-offs
- Can need several calls to assemble related data
- May return more data than you need
- Changing responses can require versioning
GraphQL: ask for exactly what you need
GraphQL exposes a single endpoint and a typed schema. The client sends a query describing precisely which fields it wants — including related objects — and gets back exactly that, in one request. It shines when many different screens or apps need different slices of the same data, as is common in mobile and rich web applications.
Strengths
- One request can fetch related data
- No over-fetching or under-fetching
- Strongly typed schema is self-documenting
- Evolves without version numbers in many cases
Trade-offs
- More moving parts to design and secure
- Caching is less straightforward
- Expensive queries need limits to protect the server
- Fewer third-party services offer it than REST
Webhooks: let the event come to you
Without webhooks you must poll: ask “anything new?” every minute, which wastes effort and still leaves delays. A webhook flips this — when something happens, the other system sends an HTTP message to a URL you provide. It is how payment providers, shipping tools and many SaaS products announce events.
What a reliable webhook receiver does
- Verifies the signature so only genuine senders are accepted
- Responds quickly, then processes the work in the background
- Handles the same event arriving twice without duplicating work (idempotency)
- Logs every event and failure for troubleshooting
- Retries or reconciles if your system was down when the event fired
- Alerts a person if events stop arriving
How they work together
- 1
REST call
Your site creates a payment session through the provider’s REST API.
- 2
Customer pays
The provider handles the card details.
- 3
Webhook
The provider sends “payment succeeded” to your server.
- 4
REST calls
Your system creates the invoice, updates stock and books shipping.
- 5
Reconcile
A scheduled job checks for any missed events.
How to choose
- Connecting to existing services: use whatever they offer — usually REST plus webhooks.
- Building an API for your own mobile or web apps with varied data needs: consider GraphQL, or a well-designed REST API if needs are simpler.
- Needing to react the moment something changes: use webhooks, with reconciliation as a safety net.
- Unsure: start with REST; it is the safest, most compatible default.
Whichever you use, the engineering around the connection — retries, security, monitoring — decides how well it works in practice. It is the same reliability theme we explore in business process automation and in our API integration service.
Frequently asked questions
Not universally. GraphQL is excellent for flexible, data-heavy front ends; REST is simpler, more widely supported and the right default for most integrations. The choice depends on your needs.
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