woocommerce_add_to_cart_product_id

apply_filters('woocommerce_add_to_cart_product_id') is found 3 times:

• /includes/class-wc-ajax.php line 456

  		if ( ! isset( $_POST['product_id'] ) ) {
  			return;
  		}
  
  		$product_id        = apply_filters( 'woocommerce_add_to_cart_product_id', absint( $_POST['product_id'] ) );
  		$product           = wc_get_product( $product_id );
  		$quantity          = empty( $_POST['quantity'] ) ? 1 : wc_stock_amount( wp_unslash( $_POST['quantity'] ) );
  		$passed_validation = apply_filters( 'woocommerce_add_to_cart_validation', true, $product_id, $quantity );
  		$product_status    = get_post_status( $product_id );
  		$variation_id      = 0;
  		$variation         = array();
  

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• /includes/class-wc-cart-session.php line 455

  		$inital_cart_size = count( $cart );
  		$order_items      = $order->get_items();
  
  		foreach ( $order_items as $item ) {
  			$product_id     = (int) apply_filters( 'woocommerce_add_to_cart_product_id', $item->get_product_id() );
  			$quantity       = $item->get_quantity();
  			$variation_id   = (int) $item->get_variation_id();
  			$variations     = array();
  			$cart_item_data = apply_filters( 'woocommerce_order_again_cart_item_data', array(), $item, $order );
  			$product        = $item->get_product();
  
  

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• /includes/class-wc-form-handler.php line 797

  		}
  
  		wc_nocache_headers();
  
  		$product_id        = apply_filters( 'woocommerce_add_to_cart_product_id', absint( wp_unslash( $_REQUEST['add-to-cart'] ) ) ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended
  		$was_added_to_cart = false;
  		$adding_to_cart    = wc_get_product( $product_id );
  
  		if ( ! $adding_to_cart ) {
  			return;
  		}
  

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