Defining authorizer and using it in API Gateway using Open API - amazon-web-services

Question

I am trying to define an authorizer and use it in a method using Open API Specification. For some reason the authorizer does not appear in the API Gateway Console after I deploy the template. Here's my template shortened:
Type: AWS::Serverless::Api
Properties:
Name: !Sub "API Gateway"
EndpointConfiguration:
Type: REGIONAL
DefinitionBody:
openapi: 3.0.3
info:
title: 'APIs'
version: 1.0.0
paths:
/callHistoryAsync:
post:
parameters:
- name: 'xxxxx'
in: 'query'
required: true
schema:
type: 'string'
x-amazon-apigateway-integration:
type: aws
requestParameters:
integration.request.header.X-Amz-Invocation-Type: '''Event'''
integration.request.querystring.store_id: "method.request.querystring.xxxxx"
httpMethod: POST
uri: !Sub 'arn:${AWS::Partition}:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${Function.Arn}/invocations'
responses:
'202':
statusCode: '202'
selectionPattern: ""
responses:
'202':
description: successfully saved
security:
- Authorizer: []
components:
securitySchemes:
Authorizer:
type: 'request'
name: 'Authorization'
in: 'header'
x-amazon-apigateway-authorizer:
authorizerUri: !FindInMap [ !Ref StageName, !Ref "AWS::Region", AuthArn ]
identitySource: 'method.request.header.X-Authorization,method.request.header.X-Date'
type: 'request'
I defined the authorizer in components under securitySchemes and I am using it in the POST method specified under security.
But the authorizer does not appear in the console and neither does it appear under the method. What am I doing wrong?

Answer 1

I figured this out using the export property of the stage tab in API Gateway. I used an existing API Gateway that was defined using CloudFormation and exported it using Export as Swagger + API Gateway Extensions. This basically shows you all the syntax you want.
Here's the screenshot where is this option in the console.
From that export I could see that I need to change my securitySchemes to this:
components:
securitySchemes:
Authorizer:
type: "apiKey"
name: "Unused"
in: "header"
x-amazon-apigateway-authtype: "custom"
x-amazon-apigateway-authorizer:
authorizerUri: "arn:aws:apigateway:us-east-1:lambda:path/2015-03-31/functions/arn:aws:lambda:us-east-1:xxxxxx:function:xxxxxxx/invocations"
authorizerResultTtlInSeconds: 300
identitySource: "method.request.header.Authorization, method.request.header.Date"
type: "request"