Configure a method to use API keys with an OpenAPI definition
You can use an OpenAPI definition to require API keys on a method.
For each method, create a security
      requirement object to require an API key to invoke that method. Then, define api_key in the security
      definition. After you create your API, add the new API stage to your usage plan.
The following example creates an API and requires an API key for the POST and
        GET methods:
      - OpenAPI 2.0
 {
  "swagger" : "2.0",
  "info" : {
    "version" : "2024-03-14T20:20:12Z",
    "title" : "keys-api"
  },
  "basePath" : "/v1",
  "schemes" : [ "https" ],
  "paths" : {
    "/pets" : {
      "get" : {
        "responses" : { },
        "security" : [ {
          "api_key" : [ ]
        } ],
        "x-amazon-apigateway-integration" : {
          "type" : "http_proxy",
          "httpMethod" : "GET",
          "uri" : "http://petstore-demo-endpoint.execute-api.com/petstore/pets/",
          "passthroughBehavior" : "when_no_match"
        }
      },
      "post" : {
        "responses" : { },
        "security" : [ {
          "api_key" : [ ]
        } ],
        "x-amazon-apigateway-integration" : {
          "type" : "http_proxy",
          "httpMethod" : "GET",
          "uri" : "http://petstore-demo-endpoint.execute-api.com/petstore/pets/",
          "passthroughBehavior" : "when_no_match"
        }
      }
    }
  },
  "securityDefinitions" : {
    "api_key" : {
      "type" : "apiKey",
      "name" : "x-api-key",
      "in" : "header"
    }
  }
}
 
      - OpenAPI 3.0
 {
  "openapi" : "3.0.1",
  "info" : {
    "title" : "keys-api",
    "version" : "2024-03-14T20:20:12Z"
  },
  "servers" : [ {
    "url" : "{basePath}",
    "variables" : {
      "basePath" : {
        "default" : "v1"
      }
    }
  } ],
  "paths" : {
    "/pets" : {
      "get" : {
        "security" : [ {
          "api_key" : [ ]
        } ],
        "x-amazon-apigateway-integration" : {
          "httpMethod" : "GET",
          "uri" : "http://petstore-demo-endpoint.execute-api.com/petstore/pets/",
          "passthroughBehavior" : "when_no_match",
          "type" : "http_proxy"
        }
      },
      "post" : {
        "security" : [ {
          "api_key" : [ ]
        } ],
        "x-amazon-apigateway-integration" : {
          "httpMethod" : "GET",
          "uri" : "http://petstore-demo-endpoint.execute-api.com/petstore/pets/",
          "passthroughBehavior" : "when_no_match",
          "type" : "http_proxy"
        }
      }
    }
  },
  "components" : {
    "securitySchemes" : {
      "api_key" : {
        "type" : "apiKey",
        "name" : "x-api-key",
        "in" : "header"
      }
    }
  }
}