How exactly did you use OpenAPI, what were the requirements?

In my experience working with OpenAPI, the main task was to create and maintain API specifications for internal and external services. The requirements included:

• Clear description of all endpoints, methods, parameters, and data formats.
• Ensuring compatibility and standardization of APIs across teams.
• Generating documentation and SDKs based on the specifications.
• Using OpenAPI for automating testing and request validation.

For example, I created an OpenAPI specification for a REST service, describing data models and possible responses, which allowed frontend developers to quickly integrate and reduced errors during API interaction.