How to interrogate a type "Reaction Tree"

I've created an expression rule to call a!startProcess(). When I run an adhoc test on it the output Type is "Reaction Tree" and Value is "Smart Service". Can someone explain how I interrogate the output as I want to be able to check the values in statusCode, response and responseMessage.


The expression rule

with(

a!startProcess(
processModel: cons!MONITORING_RESPONSE_WEBAPI,
processParameters: {
businessKey: "Test",
demandName: "Increment",
endDateTime: now(),
processRegistryId: 0,
serviceMonitorId: generateUUID(),
startDateTime: now(),
transactionUUID: generateUUID(),
userid: "Demand API",
webAPIName: "createDemandAPI"
},
onSuccess: a!httpResponse(
statusCode: 200,
headers: {
a!httpHeader(name: "Content-Type", value: "application/json")
},
body: a!toJson(
...

OriginalPostID-272911