How to Send Received Json as Payload using Rest http Connector

BPMN & Modeling Discussion & Questions
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I have a JSON request with around 12 attributes to start the Process instance and now I want the same list of attributes should be sent as payload to Rest Controller in Spring using HTTP Rest connector.

I know we can have a new input variable called Payload and then can create JSON as Value, But instead of mapping each and every variable, I want all the variables should be sent.

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