Merge Tag Config Example

MergeTags.php

<?php if ( ! defined( 'ABSPATH' ) ) exit;

return apply_filters( 'ninja_forms_register_user_settings', array(

    'example_tag' => array(
        'id'        => 'example_tag',
        'tag'       => '{mergetag_example:example_tag}',
        'label'     => __( 'Example Tag', 'ninja-forms-mergetag-example' ),
        'callback'  => 'example_tag',
    ),
));