> ## Documentation Index > Fetch the complete documentation index at: https://docs.stardeck.ai/llms.txt > Use this file to discover all available pages before exploring further. # Using Promo Codes > Learn how to correctly enter and apply promo codes during checkout ## Overview Promo codes allow you to apply discounts to your subscription when upgrading or switching plans. This guide covers how to enter promo codes correctly and what to expect when applying them. ## Where to Enter Promo Codes Promo codes can be entered in two places: ### In Stripe Checkout If you're using Stripe checkout, you can also enter promo codes directly in the Stripe checkout page. Stripe checkout code entry ### When switching plans When switching from an existing plan, you'll see a promo code input field where you can enter your code before proceeding to checkout. Plan switching code entry ## Where NOT to enter promo codes The "Secret code" field on the plan selection page is not for promo codes. Adding it there will not work. Secret code field ## Need Help? If you're having trouble with a promo code: * Contact support through your dashboard * Email [support@stardeck.ai](mailto:billing@stardeck.ai) * Verify the code details with whoever provided it to you *** *Promo codes are subject to terms and conditions. Some restrictions may apply.*