Woocommerce PHP Custom Script - Add Subscription Product to Any Product on Checkout

Currently we are forcing Subscription but it seems very complicated so I want to make a change - I want to make very EASY for customer - Steps: Customer clicks buy now Shopping cart add product + subscription product ------------------- I Found this Code that you may find helpful ------------------------------------ PHP Snippet: Add “Product Gift” to Cart if SKU is Added to WooCommerce Cart /** * @snippet Buy 1, Get Free Product as a Gift - WooCommerce * @how-to Watch tutorial @ [login to view URL] * @sourcecode [login to view URL] * @author Rodolfo Melogli * @compatible Woo 3.5.3 * @donate $9 [login to view URL] */ add_filter( 'woocommerce_add_to_cart_validation', 'bbloomer_add_gift_if_sku_added_cart', 10, 3 ); function bbloomer_add_gift_if_sku_added_cart( $passed, $product_id, $quantity ) { global $woocommerce; /* enter array of SKUs that give gift */ $skuswithgift = array('armpar','armsup'); /* enter SKU of product gift */ $giftsku = 'starter'; /* enter name of coupon that gives 100% discount for specific product gift */ $coupon_code = 'xxxyyyzzz'; $product = wc_get_product( $product_id ); if ( $product->get_sku() && in_array( $product->get_sku(), $skuswithgift ) ) { WC()->cart->add_to_cart( wc_get_product_id_by_sku($giftsku) ); wc_add_notice( __( 'Hey, Supporter! As promised, I added #CustomizeWoo Video Lessons for Free - you will be able to access them in a single place (~ My Courses ~) and get premium support.', 'woocommerce' ), 'success' ); $woocommerce->cart->add_discount( $coupon_code ); } return $passed; }