AF_XDP Actual data location in payload

[waqas-hafique]

I'm using AF_XDP example and it works as expected but so far I'm unable to locate the actual data in payload it sends to receiver. I can see sequence number (payload->seq) , timestamp (payload->tx_timestampA) etc but where can I find the actual data received in payload?
Basically I want to send some custom data over AF_XDP and wants to verify the data received is valid.