Set up SNS fanout to multiple SQS queues with subscription filter policies

Steps

1. Create an SNS topic and one or more SQS queues, then subscribe each queue to the topic via SNS console or aws sns subscribe
2. Grant the SNS topic permission to send messages to each SQS queue by attaching a queue policy allowing sns:SendMessage from the topic ARN
3. Set a FilterPolicy on each subscription (JSON attribute map) to route only matching messages to that queue; unmatched messages are silently dropped for that subscription
4. Publish messages to SNS with MessageAttributes matching the filter criteria to ensure correct routing
5. Enable raw message delivery on subscriptions where you do not want SNS to wrap the payload in its JSON envelope