Send SQS messages larger than 256 KB using the Amazon SQS Extended Client Library with S3

Verified steps

1. Add the amazon-sqs-java-extended-client-lib dependency (or the equivalent Python/Node.js sqs-extended-client package) to your project
2. Create an S3 bucket dedicated to storing large message payloads and grant the application's IAM role read/write access to it
3. Configure an ExtendedClientConfiguration pointing at that bucket, wrapping your normal SQS client to produce an extended client
4. By default, the extended client only offloads a message to S3 when its size exceeds the SQS 256 KB limit; optionally set alwaysThroughS3 to true to force every message through S3 regardless of size
5. Send messages through the extended client as usual; it transparently uploads the payload to S3 and sends a small SQS message containing a reference (pointer) to the S3 object, up to a supported payload size of 2 GB
6. On the consumer side, use the matching extended client to receive messages; it automatically resolves the S3 reference and returns the full payload, and can optionally delete the S3 object after successful processing