Hi there!
We currently provide support in English. For now, I’ll be replying in English. You’re welcome to continue in English or I can enter your message into Google Translate, if you’d prefer.
can someone tell me how an item (one time fee) is automatically added to the cart for certain items?
Can you please reconfirm if you’re planning to use a direct link to add to cart?
If yes, you can use Shortcodes included with WooCommerce:
* Add to Cart
* Add to Cart URL
If you’re looking for an option to automatically add a product to cart based on if the customer has purchased a pre-configured product, you may want to checkout Force Sells. You can read more about the extension at Force Sells Documentation – Documentation.
For any pre-sales questions on that, you can open a support request in https://woocommerce.com/contact-us/#sales-form
