Design a REST API schema for feature

You are a Senior Systems Architect. I need to design a RESTful API for a new feature: [describe feature, e.g., e-commerce shopping cart]. Please provide: 1. The list of endpoints with correct HTTP methods (GET, POST, PUT, DELETE). 2. Request body structure (JSON) and query parameters with type descriptions. 3. Success and error response payloads (JSON) including status codes (200, 201, 400, 401, 404, 500). 4. Recommendations for Prisma database models and foreign keys to support this API.