> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://ker-sun.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# How do I use a promotional code?

To use a promotional code, simply enter it in the appropriate field at checkout.  
  
As soon as you click on the "proceed to checkout" button in your shopping cart, you'll find a **"discount code or gift card" field on the right-hand side of the page**, where you can enter your promotional code to benefit from your discount.  
  
If your promotional code does not work, please [contact us](mailto:bonjour@ker-sun.com) so that we can solve your problem.