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Integrates with **Amazon Cognito** for Authorization. Features an API Usage Plan for API Quota \u0026 Throttling and API Key for Client access.\n- **AWS Lambda**: each Lambda function handles a specific event: create, get, update, delete, search (by book author, title or category) and auth events (signup and login)\n- **Amazon DynamoDB**: models a Book entity, with Author \u0026 Title as the primary key (hash key and sort key, respectively). Item-level changes are pushed to a **DynamoDB Streams**. An **Event Source Mapping** is established between the streams and a Lambda function that processes the stream and sends notifications to an **SNS Topic** when:\n  - a new book has been published\n  - a book went out of stock\n  - new formats (hardcover, paperback, audiobook etc.) are available for a book\n- **Amazon SNS**: implements a Pub/Sub pattern for book status changes. 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