Is there a direct way to set up the Tick History REST API for R programming environment?

in Part - 2

url <- "https://hosted.datascopeapi.reuters.com/RestApi/v1/StandardExtractions/UserPackages&quot;

r <- GET(url,add_headers(prefer = "respond-async",Authorization = token))

stop_for_status(r)

a<-content(r, "parsed", "application/json", encoding="UTF-8")

List of 2

$ @odata.context: chr "https://hosted.datascopeapi.reuters.com/RestApi/v1/$metadata#UserPackages&quot;

$ value : list()

The list is empty for me. Could you help me a solve for the same/any particular reason this is happening ?