Can I use clickbank in combination with another payment processor for other products on the same website ?
You can, but not on the same page. People do that to test which payment processor works the best. However, if you put them on the same page, that's unfair for affilites. nadavs
yes you can use more than one payment processor on your sales page. When I am looking for a product to promote if I see that a vendors sales page has any other payment processor than clickbank I avoid it immediatly. After all I would be working hard sending lots of traffic and then the visitor could just click and buy through paypal for example and then I would have lost my commission. Be wary of this, yes you can do it but affiliates will be very small and wary.
I've experimented with this as well; however, I wrote a php script which looks for hop=affiliate in the url and if so the payment processor displayed is clickbank. That way none of your affiliates lose sales and you could hook into many different affiliate networks.
I would not use different payment options for the SAME product but for other products. Question is if CB or other payment processors allow me using different payment processors...