I worked with this affiliate a long time ago, drove traffic a lot of regs to them - as a result they skimmed me. They minus last month's balance when someone won in the next billing period. They explained it by the fact that it was someone who withdrew money and therefore minus you the money of this player. They did not take into account that the month is over, and the win occurred only on the 3rd day and then on the 6th day of the next month. Therefore, I do not recommend not to work with them, because it is a scam affiliate.