What steps are involved in building a webservice integration?

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Accepted Answer

Integrating an external webservice follows a predictable arc: understand the API, poke it by hand, then build search → display → error handling around it.
A "webservice integration" means your app pulls live data from someone else's API instead of computing it itself. The trap beginners fall into is jumping straight to writing fetch() calls. You'll move far faster by treating it as a sequence, because each step de-risks the next:

Learn the API — read the docs to find which endpoints (URLs you can call) exist and what parameters each one takes. You can't call an API you don't understand.
Test manually first — paste a request URL into the browser, or use a tool like Postman, and inspect the JSON that comes back. Doing this before writing code means that when your app later fails, you already know what a correct response looks like and can tell "my code is wrong" from "the API is down".
Implement search/selection — give the user a way to pick what they want (e.g. typing a name and choosing from suggestions), which determines the parameters you'll send.
Implement display — take the JSON the API returns and render it into your page's UI.
Handle errors — real networks time out, return rate-limit rejections, or send malformed data. Wrap calls in timeout and error handling so a flaky API degrades gracefully instead of freezing or crashing the page.

Concretely, picture building a stationboard — a departures board like the ones in train stations — on top of the Swiss public-transport REST API at transport.opendata.ch. The same arc applies: study its docs, try a request by hand, add a station search box with autocomplete so the user finds their stop, then fetch and display that stop's upcoming departures (with sensible handling if the request fails).
Memory tip: Read it, try it, find it, show it, guard it.
Go deeper:

transport.opendata.ch API docs — the live Swiss public-transport REST API: read the endpoints, then paste a request URL in your browser to "try it by hand".