Interface SnsDestination

AWS SNS can be used to push messages to AWS Lambda, HTTP endpoints (webhooks), or fan-out messages to SQS queues. The SQS queue must be a Standard queue type.

We recommend setting `authenticationMode` to `IAM`, to avoid unnecessary key management. For IAM authentication, give permissions to user `arn:aws:iam::362576667341:user/subscriptions` to publish to the topic before creating the Subscription. Otherwise, a test message will not be sent.

If you prefer to use `Credentials` for authentication, we recommend [creating an IAM user](https://docs.aws.amazon.com/sns/latest/dg/sns-setting-up.html#create-iam-user) with an `accessKey` and `accessSecret` pair specifically for each Subscription.

The IAM user should only have the `sns:Publish` permission on this topic.
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