OpenIntegrations/docs/en/examples/HTTPClient/SetURLParams.txt

    URL = FunctionParameters["HTTP_URL"];
    URL = URL + "/get";

    ParametersStructure = New Structure("param1,param2", "text", 10);

    Result = OPI_HTTPRequests
        .NewRequest()
        .Initialize(URL)
        .SetURLParams(ParametersStructure) // <---
        .ProcessRequest("GET")
        .ReturnResponseAsJSONObject();