CPA is known as Cost-Per-Acquisition or Cost-Per-Action. In forex, CPA deals are quite high. The average CPA payout is around $500.
But the conditions are a little bit hard. First, a client should register through your link, fund his/her account, reach up to the required trading volume then finally you get the CPA offer.
This is the only and maximum payout you can get from a single client. But in the Revenue Share model, the payouts are lifetime and unlimited.