Provides a mapping template for API Gateway and SNS integration
This snippet can be used to publish messages to an existing SNS topic.
When creating the integration, ensure to have the below configuration to use the mapping template:
1. For Path override the value must be given as '/'
2. The header 'Content-Type' should have the value 'application/x-www-form-urlencoded' (include the single quotes in the value)
3. IAM role with appropriate sns:publish IAM permission
Use the following mapping template
#set($topic="arn:aws:sns:<region>:<account-number>:<topic-name>")
Action=Publish&TopicArn=$util.urlEncode($topic)&Message=$input.json('$')
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