1. Sign in to your Google Ads account.
  2. Click the tools icon, and under “Billing,” select Promotions.
  3. On the "Promotions" page, you'll see all the promotional codes added to your Google Ads account and the related amounts and statuses, including the following:
  • Active”: Reward associated with coupon has been granted.
  • Redeemed: currently earning”: Coupon was successfully redeemed, but the spend requirement hasn't been met yet.
  • Processing”: Spend requirement has been met and Google’s system is processing the granted reward amount.
  • Expired”: Coupon expired after redemption and before the spending requirement was met.
  • Invalidated”: Coupon was invalid/invalidated.

We also recommend you check this video where we show you how to check your promo code status on your account. Finally, here is a link to similar information from directly from Google.