Mapping templates in API Gateway allow you to define transformations for incoming requests and outgoing responses, facilitating integration with AWS Lambda.

AWS Lambda functions integrated with API Gateway can be associated with IAM roles, allowing for fine-grained access control based on the permissions assigned to the IAM role.

AWS Lambda allows you to configure prefix filtering on S3 event notifications, enabling you to specify object prefixes for filtering events.

Considerations for handling large numbers of S3 event notifications in AWS Lambda include managing concurrent executions and scaling strategies.

S3 events can trigger AWS Lambda functions in response to changes in Amazon S3 buckets, such as object creation, deletion, or modification.

AWS Lambda functions invoked by S3 events receive information about the event, including the object key that triggered the function, allowing you to process the relevant object.

To filter S3 events based on object prefixes, you can specify a prefix filter in the event configuration, allowing you to narrow down which objects trigger the Lambda function.

AWS Lambda can process S3 events in batch mode, allowing it to handle high volumes of events efficiently by batching multiple events together for processing.

Event transformation is a feature of S3 event notifications that enables you to modify the content of the event before it's sent to AWS Lambda.

Cross-region replication of S3 events allows you to trigger AWS Lambda functions in multiple regions, enabling distributed processing of events.