Yes, I understand that REST API Modular Input app does not meet all your need. The question is: What do you want to achieve with this app? To me, the end goal of using this app is quite basic: To pull data from one or more of applications outside Splunk. My other question is: Are these your own application, or a third-party application? Regardless, as long as you have documentation of the applications API, any of the alternatives I suggested could achieve the same end goal, some requiring more additional coding than others. @isoutamo's suggestion may save you even more coding.
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