Sorry didn’t get time to try this earlier. Tom, how can i display all post meta or multiple meta keys using code below? Thanks
add_action( 'wpsp_before_content','wpsp_add_custom_meta' );
function wpsp_add_custom_meta()
{
$meta = get_post_meta( get_the_ID(), '_your_custom_meta_key', true );
if ( isset( $meta ) && '' !== $meta )
echo $meta;
}