Hi Silvio,
I have started working on graph QL  API recently, don't know whether you need it or not now.
The exception "there is no query provided" is due to passing the multiline json data in the body or request payload. To pass the multiline data, we need to use \n instead of writing text in a newline.
For example:
{
    "query":"{
                          rockets {
                                country
                                description
                                diameter {
                                               feet
                                              meters
                                               }
                                          }
                            }"
}
This needs to be written in Blue Prism in expression editor as follows:
"{""query"":""{\n rockets{\n country\n description\n diameter{\n feet\n meters\n}\n}\n}""}"A basic implementation of the API POST in graph QL is available in the below link. Please find it as a reference.
API POST in Graph QL using Blue Prism ------------------------------
sravan goud
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	Sravan Goud
RPA Developer
Tata Consultancy Services | Hyderabad
sravan.goud3@outlook.com