mergado-wcmp.php

<?php

/**
 * This filter was added in file 'includes/tools/XML/XMLProductFeed.php' (LINE 298)
 * It allows any user to add custom params to the feed generation.
 */
add_filter('product_feed_params', function ( $params, $product, $parent_product ){
    
	if( $parent_product ){
		$product_id = $parent_product->get_id();
	}else{
		$product_id = $product->get_id();
	}
    
    $vendor = \get_wcmp_product_vendors($product_id);

    if( $vendor ){
        $params[] = array( 
            'name' => __( 'Seller' ),
            'value' => $vendor->user_data->display_name
        );
    }

    return $params;
}, 10, 3 );