{
  "openapi": "3.0.1",
  "info": {
    "title": "Pets API",
    "version": "1.0.0",
    "description": "API for managing pets."
  },
  "servers": [
    {
      "url": "https://api.yourdomain.com"
    }
  ],
  "paths": {
    "/pets": {
      "patch": {
        "summary": "Update a pet. Call this with either details for a dog or a cat but not both.",
        "description": "Update a pet. Call this with either details for a dog or a cat but not both.",
        "operationId": "updatePet",
        "requestBody": {
          "content": {
            "application/json": {
              "schema": {
                "anyOf": [
                  { "$ref": "#/components/schemas/PetByAge" },
                  { "$ref": "#/components/schemas/PetByType" }
                ]
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Updated"
          }
        }
      },
      "put": {
        "summary": "Create a pet. Call this with either details for a dog or a cat but not both.",
        "description": "Create a pet. Call this with either details for a dog or a cat but not both.",
        "operationId": "createPet",
        "requestBody": {
          "content": {
            "application/json": {
              "schema": {
                "anyOf": [
                  { "$ref": "#/components/schemas/PetByAge" },
                  { "$ref": "#/components/schemas/PetByType" }
                ]
              }
            }
          }
        },
        "responses": {
          "201": {
            "description": "Create"
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "PetByAge": {
        "type": "object",
        "properties": {
          "age": {
            "type": "integer"
          },
          "nickname": {
            "type": "string"
          }
        },
        "required": [ "age" ]
      },
      "PetByType": {
        "type": "object",
        "properties": {
          "pet_type": {
            "type": "string",
            "enum": [ "Cat", "Dog" ]
          },
          "hunts": {
            "type": "boolean"
          }
        },
        "required": [ "pet_type" ]
      }
    }
  }
}