> ## Knowledge Base Index > Fetch the complete knowledge base index at: https://help.oeni.app/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 can I activate Oeni Plus if Iā€™m subscribed to Le Petit Ballon? You should have received a **promo code** from Le Petit Ballon, which you can activate directly in the app on the **payment page** by clicking on the **Promo Code** button. This will activate your special offer šŸ’.