I have published an InfoQ news post about the AWS team's approach to provision workflow orchestration as an integrated part of serverless applications:
The AWS Serverless Application Model (AWS SAM) recently gained support for AWS Step Functions state machines. The new AWS::Serverless::StateMachine resource type enables developers to define state machines within a SAM template or in a separate file so that they can provision workflow orchestration as an integrated part of serverless applications.
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Continue reading the full post in AWS Serverless Application Model Supports Step Functions State Machines.