The phrase "a promotion code" is correct and usable in written English.
You can use it when referring to a code that provides a discount or special offer during a purchase.
Example: "To get 20% off your order, please enter the promotion code at checkout."
Alternatives: "discount code" or "promo code".
If you have a promotion code, please enter it below.
To display qualifying packages, click "I have a promotion code" and enter the promotion code PRIDE2009, then look for packages marked with the icon COUPON.
This entails calling the airline's frequent flier program or going online and giving your frequent flier number and a promotion code, available on the Web site or from a representative.
By choosing Ship Fast option (for both systems), I gave up 25% discount I was entitled through a promotion code I had.
The first 100 TechCrunch readers to retweet this article and add the hashtag #freeapollo (ha ha, retweet bots!) are getting a promotion code for the app on iTunes.
We have a promotion code so 200 TechCrunch readers can try out the beta service for free; if you're based in the US or UK, try entering 'techcrunch' in the promo code field when sending a video message from their library.
Shoppers who buy from Snapdeal's mobile site using an Android device will receive a notification that contains a Saavn Pro promotion code and a prompt to get the Saavn Android app.
Consider sending them a gift or promotion code in their welcome email.
You also want to make your offer easily shareable, either through an image or promotion code, so you can get the viral impact through social channels".
The company's customer-service reps are now forced to sort through more than a thousand promotion codes while they're talking to a potential customer.
"We take that and embed it in a bar code or promotion code".
