Processing messages from Amazon Lex

When sending messages to Amazon Lex, Amazon Chime SDK Messaging populates the CHIME.channel.arn and CHIME.sender.arn with the channel and sender’s ARN information as request attributes. You can use the attributes to determine who sent a message and the channel the sender belongs to. For more information, refer to Enabling custom logic with AWS Lambda functions in the Amazon Lex Developer Guide.