OpenAPI specification drills it’s ways into becoming a standard in many software companies. Let’s say your organization wants to follow the API-first approach. It means that before implementing any cross-team (or 3d party integration) functionality, the parties first agree on the contract, and review it.
I had this approach in mind since I’ve started working in a small payment provider company. Contracts there meant everything, and negotiating the API/authentication process was basically 80% of the job. When I joined Zalando in 2017 I was very happy to see this approach being adopted company-wise.