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<?php
class MyMessenger extends Messenger {

    ...

    public function install() {
        #
        # TODO: Place installation logic here
        #
    }
}
?>

<?php 
class MyMessenger extends Messenger {

    ... 

    public function uninstall($messenger_id, $last_instance) {
        #
        # TODO: Place uninstallation logic here 
        #
    } 
} 
?>

<?php
class MyMessenger extends Messenger {

    ...

    public function upgrade($current_version) {
        #
        # TODO: Place upgrade logic here
        #
    }

}
?>

<?php
class MyMessenger extends Messenger {

    public function __construct() {
        Loader::loadComponents($this, ['Input']);
    }

    ...

    public function upgrade($current_version) {
        // Ensure new version is greater than installed version
        if (version_compare($this->version, $current_version) < 0) {
            $this->Input->setErrors([
                'version' => ['invalid' => 'Downgrades are not allowed.']
            ]);
            return;
        }
    }
}
?>