Raw json body how to add variable?

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1

Hello,

How can I add variable to raw - json body?

 {
    "referenceId": "022078925508",
    "productCode": "001002461285",
    "quantity": "1",
    "version": "V1",
    "signature": {{Signature}},
    "applicationCode": "52e7cf966b724749a7c4efadc3727ed7"
}

resim
resim.jpg921×439 59.9 KB

Here is my pre-request script

var ApplicationCode = request.data["ApplicationCode"];
var Version=request.data["version"];
var ReferenceId=request.data["referenceId"];
var ProductCode=request.data["productCode"];
var Quantity=request.data["quantity"];
var SecretKey="e56067172e61";
var hashText = ApplicationCode+ProductCode+Quantity+ReferenceId+Version+SecretKey;
var encryption = CryptoJS.MD5(hashText).toString();

postman.setEnvironmentVariable("Signature", encryption);