global $woocommerce;

    $my_post = array(
      'post_title'    => 'My post',
      'post_content'  => 'This is my post.',
      'post_status'   => 'publish',
      'post_author'   => 1,
      'post_type'     =>'product'
    );

    // Insert the post into the database
    $product_ID = wp_insert_post( $my_post );

    if ( $product_ID ){
      add_post_meta($product_ID, '_regular_price', 100 );
      add_post_meta($product_ID, '_price', 100 );
      add_post_meta($product_ID, '_stock_status', 'instock' );
    }