This pattern implements the Saga pattern using AWS Lambda durable functions to orchestrate a multi-step order workflow.

Three checkpointed steps execute in sequence: reserve inventory, process payment, and confirm order.

If any step fails, compensating transactions automatically execute in reverse order to restore data consistency — cancelling payment and releasing inventory.

Each step uses @durable_step for automatic checkpointing. If interrupted, the function resumes from the last completed step without re-execution.

IAM permissions follow least privilege with DynamoDBCrudPolicy scoped to each specific table.