Tapjoy rewarded video inventory can be accessed through Google AdMob Mediation.
AdMob supports Tapjoy on iOS, Android and Unity platforms.
First, you should configure the Tapjoy and AdMob dashboards. Use the following documentation:
Then, you can do the technical integration into you application’s code, following the applicable documentation hosted by AdMob:
Notes on AdMob Rewarded Video Mediation
When setting up your video content card on the Tapjoy Dashboard, you should have your Tapjoy Account Manager set the fixed reward to zero and hide the reward message. (If you do not have a Tapjoy Account Manager, you can email firstname.lastname@example.org and include the email of your Tapjoy account, the exact name of the game and content card as they appear in the dashboard) This is because AdMob handles rewarding the user, and it is confusing to the user to receive conflicting reward messages from both Tapjoy and AdMob.