When using Authorize.net for your payment processor the Affiliate cannot be paid instantly at the time of sale even if you set the Affiliate to Instant Payments. Instant payments can only be made when using Paypal as your payment processor. Commissions for credit card transactions can be paid through Manual Payment after the transaction reaches 60 days past the date of sale.
You can find the Manual payment option by clicking here.
For more information on how to process Manual Mass Payments, click here. You'll also find some helpful information directly on the payment page as seen below: