For your question: The documentation says that they are accepting either request/response in json format. That is the reason I am trying to achieve using JSON Domain.
Actually we have one requirement, where the providers accepting string as json without any key and they are responding in JSON format. In their documentation they clearly defined do not send JSON Obj ...
Is there a way to send JSON String as a request in IIB. Normally we have to initiate JSON Object or JSON Array. But we have a requirement where the providers can accept only JSON String as a request ...