Developing extension on LibreOffice for Pardus OS

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Use WEBSERVICE() as I demonstrated here in Basic. Save the stream you get in response to your request to a string variable and evaluate it by the means of your choice accessing this variable.
My demo only shows a very simple (though not trivial) example using FILTERXML() in this place. FILTERXML() itself may not meet your needs, however.
Don't think of the two mentioned functions as a "tandem" as MS philosophers tend to. Don't watch silly youtube videos concerning these functions.
Once again: Standard functions of Calc can be used by LibreOffice independent of any opened document. You don't need an active spreadsheet or anything alike. Simply create a FunctionAccessObject. This is possible even if no document at all is opened by the "StarDesktop". The mentioned demo works without a spreadsheet.