How to add new column on a custom post type in WordPress back-office?

// Add the custom columns
add_filter( 'manage_ogpqrcode_posts_columns',  'set_custom_columns' );
function set_custom_columns($columns) {
unset( $columns['author'] );
$columns['ref_name'] = __( 'Ref', 'your_text_domain' );
$columns['qr_code'] = __( 'QR Code', 'your_text_domain' );
return $columns;
}
// Add the data to the custom columns 
add_action( 'manage_ogpqrcode_posts_custom_column' ,  'custom_column', 10, 2 );
function custom_column( $column, $post_id ) {
$product_ref = get_field('ref_produit', $post_id);
$post_slug = get_post_field( 'post_name', $post_id );
$imgfilename = plugin_dir_url( __FILE__ ). "qrcode-img/".$product_ref."-".$post_slug.".png";
switch ( $column ) {
case 'ref_name' :
echo $product_ref;
break;
case 'qr_code' :
echo '<a href="'.$imgfilename.'" target="_blank">Télécharger</a>';
//echo $imgfilename;
break;
}
}