# Why Is only one pre-order product added to the cart?
If you're only able to add **one pre-order product** to the cart, it could be due to the following reason:
* **Old Pre-order Model with Discount or Partial Payment Enabled**\
When using the old pre-order model **combined with Discount or Partial Payment features**, the system is limited to processing **only one pre-order product at a time**.
Additionally:
* Clicking the **Pre-order** button in this setup will **redirect customers directly to the checkout page**, bypassing the cart. This prevents multiple pre-order products from being added together.
***
> ✅ **Tip:** If you want customers to add multiple pre-order items to the cart, consider switching to the **new pre-order model** without enabling discount/partial payment features or contact support for a solution
You can understand more about how the new model works from [here](/pre-order/pre-order/shopify-selling-plan-and-legacy-model.md).
#### 📩 Need Help?
If you encounter any difficulties during setup, please don’t hesitate to reach out via **chat** or email us at ****. We're always here to help!
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