Typical usage involves several steps:

1. The service is defined in the Business Manager and configured with necessary credentials.
2. The service callback is configured once during cartridge initialization:

    ServiceRegistry.configure("MyFTPService", {
        mockExec : function(svc:FTPService, params) {
            return [
                { "name": "file1", "timestamp": new Date(2011, 02, 21)},
                { "name": "file2", "timestamp": new Date(2012, 02, 21)},
                { "name": "file3", "timestamp": new Date(2013, 02, 21)}
            ];
        },
        createRequest: function(svc:FTPService, params) {
            svc.setOperation("list", "/");
        },
        parseResponse : function(svc:FTPService, listOutput) {
            var x : Array = [];
            var resp : Array = listOutput;
            for(var i = 0; i < resp.length; i++) {
                var f = resp[i];
                x.push( { "name": f['name'], "timestamp": f['timestamp'] } );
            }
            return x;
        }
    });
    

3. A new service instance is created and called in order to perform the operation:

    var result : Result = ServiceRegistry.get("MyFTPService").call();
    if(result.status == 'OK') {
        // The result.object is the object returned by the 'after' callback.
    } else {
        // Handle the error. See result.error for more information.
    }