Thanks so much for your answers. Appreciate that.

Hi Eduard,

I got another question for you: once I create the Json stream from dynamic object and send it to the operation, I got the message body as follows:

, which is totally different from what I have in the dynamic object. The dynamic object is supposed to have several key-value pairs like:

{"a": "1", "b": "2", ...}

. How could I get the correct content from that JSON stream? Thanks so much.

Thanks so much Eduard. Your answer is really helpful.