JavaScript this scope in callback functions

How can I access object properties from functions which will be called as callback function. Please see code below. How can I access config property from processData function which will called when data is received from the server in ajax call.

MyClass: {
    config: {
        name: "",
        id: ""

    },

    loadData: function() {
        MyApi.getData(
            this.config,
            this.processData,   //sucess
            this.failureHandler //failure
        );
    },


    processData: function() {
        // how to access config object here? 
    }
}

Probably you can create an anonymous handler function and use call or apply to pass the this scope to actual handler function but is there a better solution than that?