Display vendors details within the “vendor” tab on the product page. 
<?php
add_action( 'product_vendors_tab_content_after' , 'display_vendor_fields', 2, 10 );
/**
* display_vendor_fields
*
* @access public
* @since 1.0
* @return void
*/
function display_vendor_fields( $vendor_ID, $product_ID ) {
$vendor = get_vendor( $vendor_ID );
$commission = $vendor->commission;
echo 'Commission: ' . $commission . '%';
}