[augustus]

i have some experience with this.

i researched a lot of payment gateways such as authorize.net but decided against it because they have a lot of fixed costs which you can only recuperate with high volume.

Also online processors have a lot of procedures, credit checks etc. which is a lot of pain.

I went with paypal but had a lot of trouble with theiragent when dealing with fraud.

I would probably try amazon if I was doing it today.

Once you have an established volume you can switch to a dedicated service like authorize.net. Until then it is better to pay per transaction.

Regards.

-Augustus