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Google AdMob Rewarded Ads Server Side Verification

Server-side verification callbacks are URL requests, with query parameters expanded by Google, that are sent by Google to an external system to notify it that a user should be rewarded for interacting with a rewarded video ad. Rewarded video SSV (server-side verification) callbacks provide an extra layer of protection against spoofing of client-side callbacks to reward users.

Description

This project is developed in Java spring-boot framework as an example to verify rewarded video SSV callbacks by using the Tink third-party cryptographic library to ensure that the query parameters in the callback are legitimate values.

How to use

  1. Deploy this project on your preferred web service provider.
  2. Follow the Set up and test server-sideverification instructions to create an ad unit and configure/test your server-side verification endpoint.

Local Development

To start with Java:

1 cd RewardedSSVExample 2 ./gradlew bootRun

To start with Docker:

docker-compose up --build

Local testing

To test a signature and message, send a GET request to localhost:8080/verify?<dataToVerify>&signature=<signature>&key_id=<key_id>.

A successful response looks like this:

{
  "sig": "ME...Z1c",
  "payload": "ad_network=54...55&ad_unit=12345678&reward_amount=10&reward_item=coins &timestamp=150777823&transaction_id=12...DEF&user_id=1234567",
  "key_id": "1268887",
  "verified": "true"
}