See Brief request syntax to understand each keyword.

 #!/usr/bin/env python
from ecmwfapi import ECMWFDataServer
  
server = ECMWFDataServer()
  
server.retrieve({
    'dataset' : "tigge",
    'step'    : "24/to/120/by/24",
    'number'  : "all",
    'levtype' : "sl",
    'date'    : "20071001/to/20071003",
    'time'    : "00/12",
    'origin'  : "all",
    'type'    : "pf",
    'param'   : "tp",
    'area'    : "70/-130/30/-60",
    'grid'    : "2/2",
    'target'  : "data.grib"
    })

import org.ecmwf.DataServer;
import org.json.JSONObject;
 
public class DataServerExample {
    public static void main(String[] args) throws Exception 
    {
 
        DataServer server = new DataServer(); 
 
        JSONObject  request = new JSONObject();
         
        request.put("dataset" , "tigge");
        request.put("step"    , "24/to/120/by/24");
        request.put("number"  , "all");
        request.put("levtype" , "sl");
        request.put("date"    , "20071001/to/20071003");
        request.put("time"    , "00/12");
        request.put("origin"  , "all");
        request.put("type"    , "pf");
        request.put("param"   , "tp");
        request.put("area"    , "70/-130/30/-60");
        request.put("grid"    , "2/2");
        request.put("target"  , "data.grib");
 
        server.retrieve(request);
    }
}

#!/usr/bin/env perl
use ECMWF::DataServer;
 
my $server = ECMWF::DataServer->new();
 
$server.retrieve({
    'dataset' : "tigge",
    'step'    : "24/to/120/by/24",
    'number'  : "all",
    'levtype' : "sl",
    'date'    : "20071001/to/20071003",
    'time'    : "00/12",
    'origin'  : "all",
    'type'    : "pf",
    'param'   : "tp",
    'area'    : "70/-130/30/-60",
    'grid'    : "2/2",
    'target'  : "data.grib"
    })

Please note:

The ECMWF Web API clients below have been discontinued and the examples provided here for reference only.

Unfortunately we are unable to provide help and support for using these clients and examples

Thank you for your understanding.