Lists the API keys for a given API.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/appsync/list-api-keys.html
| aws appsync list-api-keys \ |
| Build a Realtime Serverless GraphQL API with Websockets on AWS | Andrew Griffiths : http://andrewgriffithsonline.com/blog/serverless-websockets-on-aws/ |
| aws appsync list-api-keys \ |
| Build a Serverless GeoSearch GraphQL API using AWS AppSync & Elasticsearch : http://serverless.com/blog/build-geosearch-graphql-api-aws-appsync-elasticsearch/ |