{
    "openapi": "3.0.3",
    "info": {
        "title": "User Management API",
        "version": "1.0.0",
        "description": "A simple API to manage users"
    },
    "servers": [
        {
            "url": "https://api.example.com/v1",
            "description": "Production server"
        }
    ],
    "paths": {
        "/users": {
            "get": {
                "summary": "List all users",
                "responses": {
                    "200": {
                        "description": "A list of users",
                        "content": {
                            "application/json": {
                                "schema": {
                                    "type": "array",
                                    "items": {
                                        "$ref": "#/components/schemas/User"
                                    }
                                }
                            }
                        }
                    }
                }
            },
            "post": {
                "summary": "Create a new user",
                "requestBody": {
                    "required": true,
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/User"
                            }
                        }
                    }
                },
                "responses": {
                    "201": {
                        "description": "User created successfully"
                    }
                }
            }
        },
        "/users/{userId}": {
            "get": {
                "summary": "Get a user by ID",
                "parameters": [
                    {
                        "name": "userId",
                        "in": "path",
                        "required": true,
                        "schema": {
                            "type": "string"
                        }
                    }
                ],
                "responses": {
                    "200": {
                        "description": "User details",
                        "content": {
                            "application/json": {
                                "schema": {
                                    "$ref": "#/components/schemas/User"
                                }
                            }
                        }
                    },
                    "404": {
                        "description": "User not found"
                    }
                }
            }
        }
    },
    "components": {
        "schemas": {
            "User": {
                "type": "object",
                "properties": {
                    "id": {
                        "type": "string",
                        "example": "123",
                        "description": "The unique identifier for the user"
                    },
                    "name": {
                        "type": "string",
                        "example": "John Doe"
                    },
                    "email": {
                        "type": "string",
                        "example": "john.doe@example.com"
                    },
                    "user_profile": {
                        "type": "object",
                        "properties": {
                            "age": {
                                "type": "integer"
                            },
                            "address": {
                                "type": "string"
                            }
                        }
                    }
                },
                "required": [
                    "id",
                    "name",
                    "email"
                ]
            },
            "UserBalance": {
                "type": "object",
                "properties": {
                    "id": {
                        "type": "string",
                        "example": "123",
                        "description": "The unique identifier for the user"
                    },
                    "name": {
                        "type": "string",
                        "example": "John Doe"
                    }
                }
            }
        }
    }
}