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The phrase "a valid promotion code" is correct and usable in written English.
You can use it when referring to a code that can be applied for discounts or special offers in a transaction.
Example: "To receive a discount on your purchase, please enter a valid promotion code at checkout."
Alternatives: "an active promo code" or "a legitimate discount code".
Similar(60)
Some physical coupons now include a coupon code, also called a promotion code, printed on the coupon.
When you make a reservation online, you will be offered a promotion code for the car2go deal.
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.
Consider sending them a gift or promotion code in their welcome email.
A $100 credit can be redeemed in person at one of their storefronts after getting a promotion code online.
"We take that and embed it in a bar code or promotion code".
At each page, scan the page for a coupon code or promotion code option.
From the sign-up and event creation pages, only Americans with a valid zip code need apply.
The other alternative uses a naive approach that does not guarantee a valid decoded code word.
As a result, they've changed their policy and now require a valid coupon code in order to honor the price.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com