// helpers for JSON Parser
import groovy.json.JsonSlurper;

// get the previous stepIndex by deducting 1 from the current step
def previousStepInd = context.currentStepIndex - 1;
// get previous test name
def previousTestStepName = context.testCase.getTestStepAt(previousStepInd).name;
// get previous test step response
def responseBody = testRunner.testCase.testSteps[previousTestStepName].testRequest.response.contentAsString;
def jsonBody = new JsonSlurper().parseText(responseBody)

testRunner.testCase.testSuite.setPropertyValue( "orderId", jsonBody.orderPlacementResponse.orderId );