In Salesforce Industries Integration Procedures, merge fields are used to access data from the data JSON. To reference a specific JSON node from the output of a previous step, the correct syntax is %StepName:JSONNode%. In this scenario, the step is the DataRaptor Extract Action named DRReadCase, and the data node to be passed is CaseNumber. Therefore, the merge code %DRReadCase:CaseNumber% correctly retrieves the CaseNumber value from the DRReadCase step's output for use in the subsequent HTTP Action's URL.

1. Salesforce Help

OmniStudio Documentation: "Access Data in an Integration Procedure". This official documentation specifies the use of merge fields. It states

"To access a node in the output of a step

use the syntax %StepName:NodeName%." This directly validates the structure of the correct answer.

2. Salesforce Trailhead

OmniStudio Integration Procedures Module: "Use DataRaptors and Integration Procedures Together". This module provides examples showing that data from a previous step (e.g.

DRGetAccountDetails) is referenced in a subsequent step using the %DRGetAccountDetails:AccountName% syntax. This confirms the pattern of %StepName:Node%.