Untitled

add_action('b2bking_b2bcustomers_column_header', function(){
	?>
	<th><?php esc_html_e('Custom Column','b2bking'); ?></th>
	<?php
});
add_action('b2bking_b2bcustomers_column_footer', function(){
	?>
	<th><?php esc_html_e('Custom Column','b2bking'); ?></th>
	<?php
});
add_filter('b2bking_b2bcustomers_row_content', function($string, $user){
	$string.='<td>test</td>';
	return $string;
}, 10, 2);