CRUD with custom functions

Hello,

We have a back end database that we interact with using a custom library. All the CRUD is in the form of GET / POST / PUT calls to our back end. The following is what we use to interact with our database:

db.get('some-record', function(resp) { });

db.put('some-record', { hello: 'world' }, function(resp) { });

db.post({ hello: 'world' }, function(resp) { });

db.destroy('some-record', { rev: 'abcdef123456789' }, function(resp) { });

The resp variable is a JSON object. Given the above, I have been able to successfully perform all CRUD operations on our database. Now, I would like to implement a Kendo GRID with Popup Editing as here: http://demos.kendoui.com/web/grid/editing-popup.html

How do I define the update, destroy and create functions using the functions above that interact with my database?

The part I do not understand is how the 'transport' works for updating in the demo code at the above link:

dataSource = new kendo.data.DataSource({
                            transport: {
                                read:  {
                                    url: crudServiceBaseUrl + "/Products",
                                    dataType: "jsonp"
                                },
                                update: {
                                    url: crudServiceBaseUrl + "/Products/Update",
                                    dataType: "jsonp"
                                },
                                destroy: {
                                    url: crudServiceBaseUrl + "/Products/Destroy",
                                    dataType: "jsonp"
                                },
                                create: {
                                    url: crudServiceBaseUrl + "/Products/Create",
                                    dataType: "jsonp"
                                },
                                parameterMap: function(options, operation) {
                                    if (operation !== "read" && options.models) {
                                        return {models: kendo.stringify(options.models)};
                                    }
                                }
                            }