Promotional codes (also known as coupons or vouchers) offer a credit to an advertiser’s account. There’s no way to ask for a promotional code, but Google and our partners will occasionally give out promotional codes as part of specific offers. Most offers require you to meet certain criteria before the credit will show up in your account, and they’re typically for new advertisers with new accounts. You can enter the promotional code in the Billing tab of your account.
How promotional codes work
1. Enter the promo code in your account by its expiration date.
(You won’t see the credit just yet.)
2. Meet the requirement mentioned in the offer within the stated time.
(For example, spend $25 within 30 days after entering the code.)
3. Find the credit in your account within 5 business days.
Fill the form then check your email
Good luck !