REST API JSON body

Hi Kore - Before the upgrade of the platform, the JSON body for the REST API configuration was working okay. However, after the upgrade, it would seem that the platform automatically enclosed it with double-quotes.
image

thus getting a response payload of

“response”: {
“statusCode”: 400,
“body”: {
“httpCode”: “400”,
“httpMessage”: “Bad Request”,
“moreInformation”: “The body of the request, which was expected to be JSON, was invalid, and could not be decoded. A valid property value was not found.”
},

Is there a new way to configure REST API call?

For your assistance.

Thanks,
SheelaD.

Btw, I also tried the below body format, and the error is still the same.
image

It would seem that the json request body can no longer have dynamic value, which does not make sense.

I appreciate if you can assist, please.

Thanks!
SheelaD.