public static function render_columns( $column_name, $post_id ) {
		$post = get_post( $post_id );
		if ( 'popup' === $post->post_type ) {

			$popup = pum_get_popup( $post_id );

			/**
			 * Uncomment if need to check for permissions on certain columns.
			 *          *
			 * $post_type_object = get_post_type_object( $popup->post_type );
			 * $can_edit_post    = current_user_can( $post_type_object->cap->edit_post, $popup->ID );
			 */

			switch ( $column_name ) {
				case 'popup_title':
					echo esc_html( $popup->get_title() );
					break;
				case 'enabled':
					if ( 'publish' === $post->post_status ) {
						$enabled = $popup->is_enabled();
						$nonce   = wp_create_nonce( "pum_save_enabled_state_{$popup->ID}" );
						?>
						<div class="pum-toggle-button">
							<input id="pum-enabled-toggle-<?php echo esc_attr( $popup->ID ); ?>" type="checkbox" <?php checked( true, $enabled ); ?> class="pum-enabled-toggle-button" data-nonce="<?php echo esc_attr( $nonce ); ?>" data-popup-id="<?php echo esc_attr( $popup->ID ); ?>">
							<label for="pum-enabled-toggle-<?php echo esc_attr( $popup->ID ); ?>" aria-label="Switch to enable popup"></label>
						</div>
						<?php
					} else {
						?>
						<p>Popup not published</p>
						<?php
					}
					break;
				case 'popup_category':
					echo get_the_term_list( $post_id, 'popup_category', '', ', ', '' );
					break;
				case 'popup_tag':
					echo get_the_term_list( $post_id, 'popup_tag', '', ', ', '' );
					break;
				case 'class':
					echo '<pre style="display:inline-block;margin:0;"><code>popmake-' . absint( $post_id ) . '</code></pre>';
					break;
				case 'opens':
					if ( ! pum_extension_enabled( 'popup-analytics' ) ) {
						echo esc_html( $popup->get_event_count( 'open' ) );
					}
					break;
				case 'conversions':
					if ( ! pum_extension_enabled( 'popup-analytics' ) ) {
						echo esc_html( $popup->get_event_count( 'conversion' ) );
					}
					break;
				case 'conversion_rate':
					if ( ! pum_extension_enabled( 'popup-analytics' ) ) {
						$opens       = $popup->get_event_count( 'open' );
						$conversions = $popup->get_event_count( 'conversion' );

						if ( $opens > 0 && $opens >= $conversions ) {
							$conversion_rate = round( $conversions / $opens * 100, 2 );
						} else {
							$conversion_rate = 0;
						}
						echo esc_html( $conversion_rate . '%' );
					}
					break;
			}
		}
	}