Can I offer incentives for user to signup?

No. WebPartners does not allow any incentivized traffic. Incentivizing a signup with outside of approved or standard promotions is not allowed, and if caught doing so WebPartners will not pay commissions on ANY incentivized users. Exceptions can be made if you are offering a product or additional service we have agreed to. If prior written permission is not provided about an incentivized offer, this could result in your account being terminated and earnings withheld.