Validate rewarded ad views with server-side verification

Server-side verification (SSV) is another validation for rewarded ad views in your app. It's used in addition to the standard client-side callback.

Server-side verification validates each completed rewarded ad view. This ensures you're only rewarding users who actually finished watching the video in your app.

Each time a user finishes viewing a rewarded ad, AdMob uses the callback URL you provide to validate the view.

Set up and test server-side verification

Complete the following steps:

1. Sign in to your AdMob account at https://admob.google.com .
2. Click Appsin the sidebar.
3. Select the name of your app. If you can't find it in the list of recent apps, you can click View all appsto search a list of all of the apps you've added to AdMob.
4. Click Ad unitsin the sidebar.
5. For new ad units, follow the steps to  create a rewarded ad unit . For existing ad units, click the name of the ad unit.
6. Click  Advanced settings. 
7. Click  beside  Server-side verification.
8. Click Set up and verify callback URLbeside server-side verification.
9. Complete the server-side verification settings. Enter your URL and any parameters you want to use to verify callback:
   • Callback URL: The full URL you want AdMob to send to you when a user has finished viewing a rewarded ad (for example,  https://example.com/sample_ssv ).
   • User ID (optional): This is used for testing only. The user ID is a unique identifier given to each user, which lets you know who to reward upon successful ad completion. To use, set the user_id parameter in the SDK.
   • Custom data (optional): This is used for testing only. Custom data is received in the callback after a user’s successful ad completion. For example, you can include a parameter to know which level the user is on. To use, set the custom_data parameter in the SDK.
10. Click Verify URL.
    Note: You mustverify the URL before you can finish setting up SSV.
11. Click Use verified URL.
12. Click Save.

Troubleshoot SSV errors

• If the URL came back with an error, review the error message and ensure that you’ve followed the instructions for setting up SSV for  Android , iOS , or  Unity .