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Postman is the API development platform UK developers use to build, test, and document APIs. Design requests, organise collections, run automated tests, and share documentation with your team — all in one tool. The free tier covers 3 users and 1,000 requests/month; paid plans start at $14/user/month. It integrates with GitHub, CI/CD pipelines, and 30+ tools. Postman is GDPR compliant. For UK teams shipping APIs — which is nearly every SaaS team — Postman is the default workspace for collaboration between developers, QA, and product.