> For the complete documentation index, see [llms.txt](https://ymq-app.gitbook.io/ymq-product-options-app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ymq-app.gitbook.io/ymq-product-options-app/faq/why-doesnt-the-discount-code-box-appear-in-the-checkout.md).
# Why doesn’t the discount code box appear in the checkout?
Our **price add-ons** use draft orders which aren’t compatible with the **discount code box** on the checkout page.
In order to solve this problem, the app provides the function of discount input box on the shopping cart page. Please open the settings below
**The app also provides 2 other principles to achieve price addition, these 2 principles can solve this problem**
**Binding variant principle:**
Bind option A to variant A. After option A is selected, the bound variant A will also be added to the shopping cart. Please refer to the attached iamge 1
**The one-cent principle:**
Create a one-cent variant in shopify. If the add-on price is $100, 10,000 one-cent products will be added at checkout, which is exactly $100.
This principle is not open yet, if you need it, please create a one-cent variant in the shopify background, and send me the variant id, and I will set it up for you.