StepFunction_2.json

{
  "StartAt": "Generate Buy/Sell recommendation",
  "States": {
    "Generate Buy/Sell recommendation": {
      "Type": "Task",
      "Resource": "arn:aws:lambda:region:14315xxxxxx:function:Lambda_StateMachine",
      "HeartbeatSeconds": 60,
      "ResultPath": "$.value",
      "Next": "Buy or Sell?"
    },
    "Buy or Sell?": {
      "Type": "Choice",
      "Choices": [
        {
          "Variable": "$.value.body",
          "StringEquals": "buy",
          "Next": "SMS_SNS"
        },
        {
          "Variable": "$.value.body",
          "StringEquals": "sell",
          "Next": "SMS_SNS"
        }
      ]
    },
    "SMS_SNS": {
      "Type": "Task",
      "Resource": "arn:aws:states:::sns:publish",
      "Parameters": {
        "TopicArn": "arn:aws:sns:region:14315xxxxxxx:newTopic",
        "Message.$": "$.value"
      },
      "Next": "Dead"
    },
    "Dead": {
      "Type": "Succeed"
    }
  }
}