Have you designed API contracts from scratch?

Yes, I have had to design API contracts from scratch. The process typically includes:

• Gathering requirements from clients and business analysts.
• Defining the main entities and operations that should be accessible via the API.
• Choosing a data transfer format (e.g., JSON or XML).
• Designing the request and response structures, including fields, data types, and possible errors.
• Defining HTTP methods (GET, POST, PUT, DELETE) for each endpoint.
• Documenting the contract using specifications such as OpenAPI (Swagger).

This approach helps ensure clarity for developers and testers, as well as facilitates integration with other systems.