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// Calling a server-side action
({
    callServerSideAction : function(cmp) {
        // 1. Retrieve an action object by specifying the
        //    Apex method that will be called
        let action = cmp.get("c.myApexEndpoint");

        // 2. Optionally set some action parameters
        action.setParams({ firstName : cmp.get("v.firstName") });

        // 3. Configure a callback function that will be
        //    executed to handle the server response
        action.setCallback(this, function(response) {
            // Some response processing code
        });

        // 4. Optionally set some action configuration flags

        // 5. Enqueue the action so that the framework processes it
        $A.enqueueAction(action);
    }
})