Code

<?php
// Function to enqueue Google Reviews Widget script
function wp_dudecom_enqueue_google_reviews_script() {
    if ( ! is_admin() ) {
        wp_enqueue_script( 'google-reviews-widget', 'https://path-to-google-reviews-widget.js', array(), null, true );
    }
}
add_action( 'wp_enqueue_scripts', 'wp_dudecom_enqueue_google_reviews_script' );

// Shortcode to display Google Reviews Widget
function wp_dudecom_display_google_reviews_widget( $atts ) {
    // Ensure the attributes are sanitized
    $atts = shortcode_atts(
        array(
            'place_id' => '', // Google Place ID
        ),
        $atts,
        'google_reviews'
    );

    // Check if Place ID is provided
    if ( empty( $atts['place_id'] ) ) {
        return '<p>Please provide a valid Google Place ID.</p>';
    }

    // Output the Google Reviews Widget
    ob_start();
    ?>
    <div id="google-reviews-widget" data-place-id="<?php echo esc_attr( $atts['place_id'] ); ?>"></div>
    <script>
        // Initialize the Google Reviews Widget
        document.addEventListener('DOMContentLoaded', function() {
            if (typeof GoogleReviewsWidget !== 'undefined') {
                GoogleReviewsWidget.init({
                    placeId: '<?php echo esc_js( $atts['place_id'] ); ?>',
                    container: '#google-reviews-widget'
                });
            }
        });
    </script>
    <?php
    return ob_get_clean();
}
add_shortcode( 'google_reviews', 'wp_dudecom_display_google_reviews_widget' );

// Function to add settings page for Google Reviews Widget
function wp_dudecom_google_reviews_settings_page() {
    add_options_page(
        'Google Reviews Settings',
        'Google Reviews',
        'manage_options',
        'google-reviews-settings',
        'wp_dudecom_google_reviews_settings_page_html'
    );
}
add_action( 'admin_menu', 'wp_dudecom_google_reviews_settings_page' );

// HTML for the settings page
function wp_dudecom_google_reviews_settings_page_html() {
    if ( ! current_user_can( 'manage_options' ) ) {
        return;
    }

    if ( isset( $_POST['wp_dudecom_google_reviews_nonce'] ) && wp_verify_nonce( $_POST['wp_dudecom_google_reviews_nonce'], 'wp_dudecom_google_reviews_save_settings' ) ) {
        update_option( 'wp_dudecom_google_reviews_place_id', sanitize_text_field( $_POST['wp_dudecom_google_reviews_place_id'] ) );
        echo '<div class="updated"><p>Settings saved.</p></div>';
    }

    $place_id = get_option( 'wp_dudecom_google_reviews_place_id', '' );
    ?>
    <div class="wrap">
        <h1>Google Reviews Settings</h1>
        <form method="post" action="">
            <?php wp_nonce_field( 'wp_dudecom_google_reviews_save_settings', 'wp_dudecom_google_reviews_nonce' ); ?>
            <table class="form-table">
                <tr valign="top">
                    <th scope="row">Google Place ID</th>
                    <td>
                        <input type="text" name="wp_dudecom_google_reviews_place_id" value="<?php echo esc_attr( $place_id ); ?>" class="regular-text" />
                        <p class="description">Enter your Google Place ID to display reviews.</p>
                    </td>
                </tr>
            </table>
            <?php submit_button(); ?>
        </form>
    </div>
    <?php
}
?>