Hi New_To_adCenter,
If you have redeemed a promotion code and want to see how it is being applied, view your online billing statement. A promotion code history table shows each promotion code amount, status, redemption date, expiration date, and the promotion code amount used (the "spend to date").
1. Click the Accounts & Billing tab.
2. Click the Billing tab.
3. In the Account drop-down list, select an account.
4. In the Show activity for drop-down list, select a time period, and then click Go.
5. Navigate to the last page of the billing statement and look for a separate table of promotion codes that have been applied to your account.
Thank you,
Brian H - MSFT