lottery sales and commission

SUGGESTED

A retail store which sales lottery in Ontario, and ONTARIO LOTTERY  will pay the store commission in the name of a discount. for example, on  Dec 06, the store sold on-line products $1,429.2, instant products $1,869 , commission is $334.95. ONTARIO LOTTERY  charged the store 1429.2+1869-334.95= $2963.25, 

do I need to record all transactions? because lottery sales in Canada are tax-free,  but I am not sure the commission is tax-free or not.

If needed, how can I record the transactions?

At now, just for reconciliation, I just recorded ONTARIO LOTTERY charges and did not record commission.