title: Get AWS Lambda Function Name or ARN from API Gateway Method ARN in Custom Authorizer
body: <p>I get the following <code>methodArn</code> from the event payload when I invoke my Lambda Authorizer in my API Gateway:</p>
  
  <p><code>arn:aws:execute-api:us-east-1:account-id:api-id/stage/GET/entity</code></p>
  
  <p>I would like to get the name of the associated Lambda or, preferably, the ARN of the Lambda associated with that API Gateway method.</p>
  
  <p>How can I do it?</p>