If you are sending push notification in Tapjoy dashboard, you will see following option at the bottom of the sending push page.
You can input text if you enable Custom Payload with the switch.
With Custom Payload, you can do followings:
You can receive and handle this information using the Tapjoy SDK.
For implementation details see the following documents:
We do not support accessing the custom payload feature through Unity. You can refer to Android’s and iOS’s guide above.